Thanks for that info! On Monday, July 13, 2015 at 12:44:04 PM UTC-7, Leslie wrote: > > On Monday, July 13, 2015 at 3:26:47 PM UTC-4, mho wrote: >> >> Does the top tube height change much when you go from 700c 28 (or 33 Jack >> Brown) to 650b 42? >> > > Corrected version! > > I'll confess, I did not physically measure my actual top-tube-height prior > to converting (and, I haven't after-the-fact either, actually). But yes, > the top-tube will drop a little bit. > > The Ram was targeted to fit the RolyPoly, which is pretty much a 700c-27 > in actuality. (I ran the RuffyTuffy version instead.) > The Hetres (although usually called a 42, is probably more like a > 650b-41), should be really close to the same size. In 700c, I ended up > later running 32's, so there was a little more drop w/ it, gave me > acceptable fender clearance. But if you're running a smaller 700c tire, > like the 700c-27, it might be, what, 1mm or so? (I did the math back at > the time ahead of actually converting, to see what it might look like... > but don't recall the exact figure off the top of my head). A bigger > 700c-28, or a 700c-32, is going to be a little bit more noticeable, in > having the top-tube drop a little bit when straddling. It would be even > more pronounced if you went on down to a 650b-38... at that point, you > will start to have a lot more issues w/ crank-length, and would be losing > some of the fatter-tire advantage of going to a 650b in the first place. > > (Realize, this is coming from the guy running 700c-40's on his > canti-Rom... I can ride them at 50psi or less, but if I pump up the rear > tire above 60psi, I can start to hear the center-tread brushing the screw > that I used to plug the hole underneath the rear bridge (I left the screw > just a tiny bit proud from the bridge itself instead of fully flush, just > to be an 'indicator' that I need to back the psi off).) >
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