Bike Forums - View Single Post - C&V 650b conversion

11-19-16 | 01:32 PM

#103

gugie

Bike Butcher of Portland

Joined: Jul 2014

Posts: 12,459

Likes: 8,002

From: Portland, OR

Bikes: It's complicated.

Quote:

Originally Posted by bikemig

Which bike are you running the 42 mm tire? Which one the 50 mm tire? From the posts here, it looks as if many 650 conversion bikes top out at 38 mm tires.

I've done several 650b conversions, all with 42mm wide tires. 1971 Raleigh Internationals have long chainstays

~73 or earlier Competitions (this one by J.P. Weigle):

same vintage Super Tourers fit them nicely:

image courtesy of bear_a_bug

Earlier Motobecane Grand Record frames have shorter stays, but the chainstays are dented, giving them clearance.

My UBI bike with Rat Trap Pass (52mm measured):

The UBI bike was purpose made for those tires. I doubt there are many, if any vintage non-MTB frames that would accept them, but converting a steel MTB from that time period to drop bars is pretty standard, and easily done, since they're already designed for 26" fat tires.

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