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Is anyone riding the R20 Birdy?

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Is anyone riding the R20 Birdy?

Old 03-17-20, 09:48 PM
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keyven
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Is anyone riding the R20 Birdy?

Just wondering if anyone is riding the R20 Birdy with 20" wheels? What do they think of it, and how much difference does it feel compared to the earlier models?
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Old 03-18-20, 04:55 AM
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Jipe
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Before deciding about the wheel size of my new wheels, I tried it temporarily with ETRTO 406 wheels from another bike (but without front brake as the Birdy disc needs a special hub with the disc on the right side at a different position than the standard left side disc).

The real difference doesn't come from the wheel size but from the tires type+width.

Since you can only put narrow up to 28mm tires on the ETRTO 406 wheels and that all 28x406 tires are high pressure road tires, it rides more or less the same than similar tires on the ETRTO 355 wheel but is different from what you normally experience with the Birdy because all usual Birdy tires are much wider with lower pressure.

Te results is a faster bike, more reactive. For me the comfort is still OK due to the full suspension but others may consider it not comfortable enough.

FYI, after this test, considering that there are too few tires types possible with the ETRTO 406 wheels, I decided to mount... ETRTO 349 wheels for which there are now more tires types than in ETRTO 355 (and especially more high performances road tires).
My Birdy is equipped with Greenspeed Scorcher 120 tires inflated at 7bar which are very fast tires, as fast as the best 28x406 tires (the Schwalbe Pro-one).
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Old 03-18-20, 07:10 AM
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keyven
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Thanks for the informative reply. I'm still holding hope that I can install a less racing-oriented tyre and one that's more off-road. Do you know what's the widest tyres (or model) that can be used? It seems here the R20 comes with Panaracer Minits pre-installed (20 x 1.25).
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Old 03-18-20, 06:34 PM
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I do not have an R20 but I do have a set of 406 rims on my Birdy using 28-406 Conti Contact Speeds. Since it's hard to find actual information on the mod, here are some pictures showing the front clearance (the rear has quite a bit more space) and how the fold is affected.






Last edited by grayrest; 03-18-20 at 06:41 PM.
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Old 03-19-20, 03:33 AM
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The first limitation is the front mudguard especially the two bolts.

With my wheels equipped with Schwalbe Pro-one 28-406 (old model, not the 2020 ADDIX model) that are in fact 32mm wide, I had to remove the front mudguard.

If you do not want a front mudguard or if you modify the mounting of the front mudguard with flatter head bolts, it will be possible to mount wider tires but I do not know how wide. I doubt that you could mount MTB ETRTO 406 tires that are much wider than 28mm.

For the Conti above, I guess they are really 28mm wide (I have Conti Grand Prix 28x406 on another bike and they are really 28mm wide).

I also have Panaracer Minits Lite PT and on my wheels these are only 30mm wide while they are announced as 32x406 tires.

BTW, my Birdy is a Titanium gen3 Birdy, I do not know if the tire clearance is the same as on the aluminum Birdy. The only thing I can say is that the mudguards are the standard mudguards used for the aluminum Birdy.
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