A few weeks back a friend and I were offered a Riese und Müller Birdy that dates from 2001. The hope was that we could make something of it and use it, as the thing had been sitting in a storage room unused for more than 5 years. The bike itself had cost 2199 Deutschmarks (1125 Euro) 18 years ago. It also had a carry bag with it. Having used a Decathlon folding bike before (reasonable, but not very pleasant to ride), and not having enough cash for a Brompton, this project was worth a try.

As it looked… and below with the broken mudguard, luggage rack (removed) and old elastomer.

First an assessment: what does a foldable bike for city use need?

Mudguards (this one had an unusable cracked plastic back one, nothing on the front) and some way to mount a bag on it (this one had a bent, very low luggage rack and nothing else). In addition the handlebar grips were all mushy, the pedals stiff and missing reflectors, and the saddle damaged on the edges. The rear elastomer that softens the ride fell apart in my hands. And a new chain is always a good idea. The tires looked OK, but the reviews of early Birdy tires were not good, so those and the inner tubes were replaced too. There were mounts for lights, but no lights. There was also no lock. Brakes and gears all looked OK, so for the moment those stayed.

So the purchases for the repair were as follows:
1. Saddle – Decathlon Sport Komfort 500 Red – €9.99 (normally €18.99) (ordered with Decathlon online) – simple semi-sporty saddle
2. Pedals – Decathlon Folding Pedals – €12.99 (ordered from Decathlon online) – Birdy normally does not have folding pedals, but these worked well on the Decathlon folding bike I used to use, so were chosen here to save a bit of space. They are heavy but reliable
3. Tires x 2 – Schwalbe Marathon RACER 40-355 18 inch RaceGuard – €27.90 (ordered from eBay here) – puncture proof
4. Inner tubes x 2 – Schwalbe Nr.5 18 Zoll Presta Valve – €15.00 (ordered from eBay here)
5. Chain – KMC X8 Chain Silver Grey 8-Speed 114 Links – €9.95 (ordered from eBay here) – KMC recommended by a bike-mad friend of mine
6. Front and Rear Reflectors – unbranded – €3.95 (ordered from eBay here)
7. Front and Rear Lights – unbranded, USB-rechargeable – €11.98 (ordered from eBay here)
8. Grips – Velo Attune, asymmetric to fit the grip shift gears – €14.90 (ordered from eBay here) – I like ones that you can rest palms on, so these are perfect
9. Rotating Bell – unbranded, goes around the handlebar so very durable but small – €6.00 (ordered from eBay here)
10. Aluminium mud guard supports x 2 – unbranded – €13.80 (ordered from eBay here)
11. Black metal mudguards – unbranded – €5.00 (one off from eBay Kleinanzeigen, similar on eBay for €19.90 here)
12. Birdy Elastomer – Standard medium hardness red – €19.90 (online from dedicated bike shop Per Pedale here)

Two items – neither of crucial importance – have long shipping times and have not arrived yet
1. Anti Theft Quick Release QR Skewers – unbranded – €9.75, shipping from Singapore (ordered from eBay here)
2. Kickstand – unbranded – €4.29, shipping from China (ordered from eBay here)

Two purchases needed a lot more consideration
1. Lock – Abus Bordo Granit X-Plus 6450/85cm – €74.99 (usually €95.99) (ordered with Decathlon online)
The issue here is where to mount a lock on a folding bike? A D-Lock is too large to mount, and chains I always find messy. So a foldable lock was the best bet. The Abus Bordo Granit was the best rated foldable lock in Stiftung Warentest’s May 2019 study, although I went for the shorter and lighter 85cm version as opposed to the 110cm version.
2. Bag – Decathlon Businessbag 500 15 Litre Black – €39.99 (ordered with Decathlon online)
Most Brompton riders mount bags on the handlebars, but there was no way to put a Brompton mount on the Birdy. A regular rear luggage rack impedes the folding mechanism, so that was out too. So the best compromise was a Decathlon handlebar mounted laptop bag, that uses a standard Rixen & Kaul mounting system.

Shipping for the whole lot was just under 40 Euro, and I needed a few odds and ends from my local DIY store (see below) for about 10 Euro.

So that gives a total of 330 Euro.



So the Anti Theft Quick Release QR Skewers and Kickstand arrived from China. Skewers are easy to fit and work well. Kickstand is a pain – because there is basically only one mounting bolt – the axel bolt. This means the kickstand turns a bit. It works, but you cannot put much weight on it.

The front and rear reflectors arrived from eBay but fitting these was a bit of a pain. The front one has to be mounted right at the bolt holding the front mudguard, or else you knock it when folding the Birdy. The back one I mounted under the saddle, and this then cracked at some point when the saddle flexed, and needed to be stuck back together. At some point I need to better reflect how to better resolve this issue, but for now the reflectors are holding.

Despite them initially looking OK, the original brake blocks turned out to be horrible – they produced loads of dust. So I replaced them with PROMAX brake blocks with removable pads (ordered from eBay here) – cost is 20 Euro, but I have these blocks on another bike and like them a lot. This takes my total cost to 350 Euro.

Most annoying however are the mudguards. The aluminium rods I used to secure the mudguards have a tendency to bend (and this can happen when transporting the Birdy) and this then means the mudguards touch the tires. These sometimes need bending back into shape before setting off. The space at the top of the front wheel – between tire and mudguard – is very restricted, and the tire can easily rub here. The allen key bolt I used to secure the back mudguard also kept coming partially loose (loose enough so the mudguard would rattle, but never enough to drop off), and this was then replaced with a longer bolt that seems to hold. In short: what was already a messy process to get the mudguards to work ended up being even more work – but I think things are fine now.

But then the good news: this bike is fantastic. It rides well, and is fun and quick to ride. I have already taken it to Rome, Bruges, Maastricht, Brussels, London and Aix-en-Provence, and cycled it from Tourcoing to Lille, and from Bruges to Blankenberge and back. Having it with me on business trips, especially to small-ish cities where the only public transport is buses, has been transformative.



Then what needed to be done for the repair?

The Birdy has a special system to mount the saddle on the seat pole, but this only needs Allen keys to adjust it.

Tires and inner tubes need bike tire levers to remove and replace, and 18 inch tires are hard to fit (the smaller the tires the harder it is).

Pedals are hard to remove without a dedicated pedal wrench – without that you probably need a bike shop to do it for you.

The old chain had to be removed with a chain tool (you could saw it off I suppose!) and the new chain was precisely the right length had a quick fit link to fit it.

Lights and the elastomer could be mounted without tools. The handlebar bag can be fitted using just screws and a Phillips screwdriver.

The velcro straps provided with the Abus Bordo lock are too short to go around the Birdy frame, so I used 4 long cable ties to mount this – they cost a few Euro at my local DIY store.

The frame and all components needed cleaning – rags, and WD40 for a few places, and some acetone to remove sticker glue residue in a few spots.

In short: all of that is pretty normal…


But there is a problem. A big problem. The mudguards.

Lots of Birdy bikes do not have mudguards. For good reason! Because – especially on this early Birdy version – they are an absolute pain to fit. Doing so required hours of work, and a lot of trial and error.


Rear wheel

Here how to mount the mudguard is quite obvious – there is a mounting screw hole on the frame above the tire, and two holes above each end of the axels – as shown:

The problem is to then get the mudguard supports mounted at the right angle – position them too low and the bike handlebars will not fold! You need an angle of about 35 degrees upwards at least!

You need a number of different 5mm bolts to secure the guards and the supports, and some fat washers to bring the mudguard closer to the wheel from the frame. I also used a Dremel to cut the supports to the correct length, and I also shortened the mudguard as well – using the Dremel to cut it. You might also need to drill further holes in the mudguard to mount it as well. But, with a few hours of work, and some trial and error, it works.

Take a deep breath. Because that was the easy one!


Front wheel

There is only one mounting point for the mudguard on this Birdy – on the front above the wheel, as shown:

The problem is that a mudguard with just one mount is always loose and wobbly. You do need to use this mount though, and need a long bolt, 5mm width, for this – the one I used was 35mm in length, and was bought from my local DIY store.

I then searched for further solutions for the second mount, and started with the one explained by Alexander Gottfried here. This uses a Rawlplug inside each hinge as a mounting point.

This was my first try, as seen from below:

Putting the aluminium mudguard supports on the outside of the mudguard, and cutting and bending them to shape, nevertheless resulted in the supports being too wide – they would snag on the frame when folding the bike (you can see the narrower frame parts in the picture above).

The solution was to cut two notches into the side of the mudguard, again using the Dremel for this, and to keep the supports straighter and narrower, as shown here:

This leaves only 6mm of so between the support and the side of the tire, but I can live with that – and the bike folds! This is how it looks:

This fix took a lot of messing around, and filing and bending metal. And without a Dremel or equivalent tool would not have been possible. Not for the faint hearted!

I contacted Riese and Müller to enquire if a mud guard kit for this Birdy was available, but after three weeks still do not have a reply.


So did all this work make sense?

Time will tell. At the time of writing I have only ridden the Birdy for 20 minutes. The ride quality is excellent, and everything works well after the repairs. Folding it is a bit of a pain – I am not as good as this dude yet! All folded it measures 35 x 75 x 57 centimetres, and fits neatly in its carry bag. I will take it with me on a 10 day work trip to France, Belgium and Italy next week, mainly as a means to avoid French rail strikes in a few places, and we will see how it fares. As I gather experience with it I will update the blog post accordingly. But for now I am content – it all works, and seems to behave in the way I want!

For the moment though, here a few photos after the repairs!


  1. jillian barrett

    Thank you I’m just about to buy a MK1 Birdy. The seller said to make her an offer, any idea of what I should offer her? As i have no clue at present, she said it has some cosmetic damage, don’t see an option to post a photo of it here.

  2. Vincent

    Very useful article!

    > Most Brompton riders mount bags on the handlebars, but there was no way to put a Brompton mount on the Birdy.

    H&H from Taiwan just came up with an adapter to mount a Brompton luggage block 🙂

  3. Thank you! Great article. This explains why most Birdy bikes i see dont have fenders. I

  4. Jack W

    Hi Jon

    Nice to come across this article; your bike is looking really smart. I’ve just inherited a Mk1 Birdy (in blue), not sure on year, but I know my grandad had years out of it even at 82!. I’d be interested to know your thoughts on the viability of repairs – seems like a snapped stem and lack of rear elastomer are obvious starters but I don’t know how deep my pockets will have to get. Perhaps I could send on some pictures and you might have some ideas on where to source parts? All the best, Jack

    • Hi Jack!

      Thanks for the comment – this is *exactly* the sort of comment that makes me happy I posted this guide!

      First the easy one – sourcing elastomer is not too hard. You can get these here:
      Regular 50-90kg (red)
      Hard 70-110kg (green)
      Soft under 60kg (yellow)

      Now to the more complex one… the stem. This is a well known problem with older Birdys (see this in German for example). But your problem here, like a lot of things for Birdys, is where / how to get the spares! Here in German you need to look for “Birdy Vorbau” – see this for example – and it says the replacement is not an easy job… I hope that helps a little!

  5. Richard

    Well done. What is the overall weight of the bike now (without the heavy lock)?

  6. Hi
    This is all very interesting & it’s great you’ve documented it. I would have loved to have had a chat with you before you did all this work because I had a red mk1 Birdy which I used for commuting and came up with all the difficulties you have had. Broadly, these were the rack (where to mount) and the mudguards (a flappy joke). I did something similar to you for the front mudguard, creating one new mounting point and was proud of it looking very professional, seeing as I had spent many hours bending bits of mudguard spokes to create a really nice effect. But what I did regarding the rack was different; this was 2006 and I had just started commuting into London, wanted a Birdy but resented spending I think about £1200 on a new one. So, I bought a mk1 and then started noticing why the makers changed the design a bit but still called it a mk1 – broadly they changed the geometry of the front end so that a mudguard would fit it properly and above where the rear elastomer is bolted on, they created a hinge mounting point for the rack that would fold down automatically. Prior to this, the official rack for the mk1 Birdy was held up by a bit of wire which would break from time to time and was an appalling design. The new rack that fitted the newer mk1 Birdy was an identical fit for the later mk2 so it was easy to get hold of. But I went a stage further, bought one of the joke racks, copied the geometry of the later rack and the hinge. I created the missing hinge mounting point by mounting a piece of steel from a door hinge (cut to shape) and held it on by using the same bolt that held on the rear elastomer. I can dig out some old photos if you like. The advantage is that you can then fit serious bags higher up on the rear rack. I spent a lot of time on that project, but it really was worth it. Some years later I bought a mk2 (more rigid frame, rear hub gears) & sold the unique modified old bike for next to nothing. But I have happy memories of it!

  7. Jim Walker

    Hi Jon,
    I’m happy to have found your article. Nice work to update your 2001 Birdy, its a great looking bike.
    I’m in a similar situation here in New Zealand. Last year I bought a 2003 Birdy Mk1 from its first owner who had bought it new in Germany, and brought it with him to NZ.
    It has been a well looked after bike, with an upgrade to a 7 speed Nexus hub, and a new seat a few years ago.
    I’ve used it as a daily commuter for nearly a year, and during lockdown have stripped it down to give it a really good clean and check over.
    I’ve found that there is a bit of play in one of the bearings that the rear suspension arm hinges on.
    I’ve been looking on line to try to find a source for parts for the Mk1 Birdy, without much success.
    Have you had any similar problems, and do you have contact details for places to source parts like bearings?
    Cheers Jim

    • Hi Jim – that’s quite a story! I can’t imagine there are too many Birdys that far from the home market!

      I am afraid I cannot help you much with your query though. I do not have the same problem as you do, but I did contact R+M to see if they could supply me with mudguards for my model and they basically told me to go to hell because my model was too old (OK, they told me slightly more politely, but it wasn’t a helpful response!)

      The best bet is probably perpedale.de – they seem to be the online shop in Germany with the best range of Birdy spares, and were able to send me an elastomer for my Birdy very speedily. I would start with them.

  8. Thanks Jon. Much appreciated. I had a Brompton but the thrill I get rising the Birdy cannot compare. Just when I havr about given up on folders 🙂

  9. Birdys are very good for commuting. I have covered about 40,000 km. The fold is not as good as a Brompton for sure but there is much more comfort. There are definitely folding racks for birdys as another commentator said. I have 1. Also there is a fix for fixing a Brompton bag mount block to the front of the bike and if you search for a paris-based Blog it has details. I have exactly the same 2001 Birdy: it now weighs is 8.5 kilos with carbon bars and 20 inch wheels with road tires. I would be careful of putting that bag on the handlebars because the original stem was weak at the top and occasionally cracked so check it frequently. I have cracked two of those and eventually bought a much more modern stem costing about 250 Euros. Hope you enjoy your bike I find them fantastic for daily use and the folding becomes easier as you master it. R&M are unfortunately not prioritising their old birdy spares and sometimes you have to order from Asia these days. On mud guards, most of us use plastic mtb mudguards / mud catchers with just one fixing Point. Not as good as yours but they do the job and cost under 20 euros.

  10. Paul Megson

    I bought a Mark 2 Birdy, with the monococque frame, in 2006 just after it was introduced. It was a replacement for a vintage 1988 Brompton which was written off in an accident at Hyde Park Corner. I bought it for its ride quality which was certainly superior to the new Brompton I tried at the same time, but quickly concluded that it just didn’t work for what I intended, which was multimodal commuting where I was folding it up three times a day (for the train to work, the train home, and at the office) and stuffing it under the seats on the train. There is still nothing which beats the Brompton for that.
    It then languished in the shed for some years until I had the notion of using it for a tour of the East Fjords of Iceland, where I only had to fold it for the flights there and back.
    It came with a folding rear rack which tucks in neatly to the folded frame, and a similar cordura carrying bag which packs up to form a small rucsac, so with the addition of the “lowrider” front rack sold for the current Mark 3, and fitted with some fiddling, swearing and adjusting, I had a four-bag tourer.
    I find the ride is in some ways superior to a standard 700C equipped bike. The frame is nice and rigid and although a bit twitchy as all small wheel bikes are, it handles well, accelerates well, and is comfortable over fair distances. I was riding almost entirely on paved roads with a max gradient of about 5%, with about 15km on one gravel section of Iceland’s N1 highway. My maximum distance in one day was about 76km, about 400km over 8 days. I had clothes etc for 10 days, tent, sleeping bag, inflatable sleeping mat and pillow, towel etc, plus pump, tools etc, and the bike handled all this fine.
    In fact it worked so well, that I am planning another outing this spring, from Bordeaux to Toulouse along the Canal de la Garonne – a lot warmer and less wild and remote than Iceland!
    I did find that the bag didn’t offer quite enough protection for the brutal handling it got on my flight to Keflavik and it was lucky I had packed a roll of Gorilla tape to patch up a cracked mudguard and chainguard, so next time I’m going to take a couple of inflatable camping pillows that I can partly inflate to provide extra protection for the more fragile parts.

    • Thanks for the comment!

      I agree the bag offers little protection – I would not use it on a flight. But I am mostly going to be taking this on long train trips (Berlin to Aix-en-Provence next week, Bruges to Rome the week after) and for those purposes the bag will do just fine.

      I agree with your point about the folding, and that this is not the bike for daily commuting, but I am also not going to be doing that – or at least not every day! 🙂 It will be mainly come with me on business trips from Berlin by train, once a week or every other week, and for that I think I can tolerate it!

  11. Michael

    Nice article! Wondered about the Decathlon folding bike – thought about buying one – but would you recommend it?


Leave a Comment

Your email address will not be published. Required fields are marked *