Snake
Hi
Has anyone tried using 650b on either the Lynskey Cooper or ProCross? If yes, what was the widest 650b tire that could you fit? Thanks!
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owly
Here's a ProCross build I came across some months ago:- 
https://www.pedalroom.com/bike/lynskey-all-road-pro-cross-30578

Those are Compass SwitchBackHill 650b x 48, and 650b x 2.1 ThunderBurts, and Mamba tyres.
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nalax
I have an Urbano, which is the same as the Cooper CX with different cable routing. With WTB Byways, I have about 7-8mm clearance at the chainstays. My Byways measure 46-47mm. Lynskey told me that older models of the Cooper CX without the drive side chainstay plate will not clear 650 plus tires.
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Snake
Thank you for the replies.  I have a 2016 ProCross with the plate.
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cyclostf
Hello Snake,

Did you use your ProCross with 27.5 wheels? If so, can you confirm what is the widest tire the frame will accomodate?

Many thanks!
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Evomann
I have a 2018 Cooper CX with an Enve fork. I have a 650b wheelset for it and had been running WTB Byways, which worked well and had penty of clearance.  Recently I installed Schwalbe Thunderburts and the rear clearance was tight but looked OK (if I remember correctly they measured 50 mm or just under 2" on my caliper).  On my last ride though I noticed a little rub, and saw the wheel has come out of true a bit and the tire has expanded some since I installed it.   My caliper now reads 51.5 mm knob to knob.  I may cut the side knobs down a bit & true up the wheel before bailing, but if mud is a factor I think 1.95 is a big as we can go.  Shame, because I love the Thunderburt.  Will keep it on the front and find something a bit smaller for the rear if need be.    fullsizeoutput_af9.jpeg
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cyclostf
Thanks for the very informative reply! It will help narrow down my choices.
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nalax
Evomann, what width rims are you using? I've considered Thunder Burts on my Urbano and wonder if my WTB i19 rims would give me a narrower tire and more clearance. Currently my 650b wheels have Byways and my 700c has GP4000's. Both ride very well in their terrain.
Also, that's a great looking Lynskey you have!
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Snake
The 650b project for my ProCross is now on the back burner
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Evomann
nalax wrote:
Evomann, what width rims are you using? I've considered Thunder Burts on my Urbano and wonder if my WTB i19 rims would give me a narrower tire and more clearance. Currently my 650b wheels have Byways and my 700c has GP4000's. Both ride very well in their terrain.
Also, that's a great looking Lynskey you have!


nalax,

Thanks.   It's a nice bike and works great on gravel.  Those wheels are 24mm wide with an inner width of 19mm.   I also have a set of Ibis 928 700c carbon wheels shod with Maxxis Rambler 40's.  I run that setup most of the time but switch to the 650's if I'm riding out to my local singletrack or if I'm going to encounter lots of our Florida sand. 
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