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?
>
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).
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, but, just a tad lower. 1mm? (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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