Hi there. I'm toying with turning one of my old tourers into a 650b, and the fit may be close depending on the tires I choose. Anyone have Grand Bois Hetres in use? I'm wondering what the actual measurements are when pumped to appropriate psi- both width and the overall diameter it creates on the wheel. If anyone can fill me in, that would be great. Thanks!
Last edited by kiwigem; 06-23-11 at 07:50 AM.
'71 Mercian, '72 Jeunet, '82 Jack Taylor, '13 Rawland
There have been several production runs of the Hetre, with stated widths being either 41 or 42mm, depending on the lot. I think the newer ones are labeled as 42mm, and the ones I purchased this winter are labeled 42mm. They measure 41.0mm wide on Velocity Synergy rims. That's after about 200 miles of use and with a psi of about 35-40lb. I don't know the height measurement from rim to tip of tread-- that would be harder to measure.
Always a good idea to measure and make sure you have PLENTY of extra clearance (ya never know when you'll want to add fenders)
here is a good list of measurements to keep in mind http://650b.webs.com/conversions.htm
Also, there is a 650B listserv at GoogleGroups
lots of very helpful folks there
Thanks for the quick response, southpawboston! You're right, "height" was not the best way to approach what I really need to know, which is the overall diameter with those tires (close to 700c?). I've edited my original post.