I did run Grand Bois 30's sith SKS 35's.  Clearance was tight as you described 
for the 45's and there were a lot of pebbles that scraped their way through.  
The clearance was tight and while I never had a problem while riding I often 
had to adjust the fenders after transporting the bike.  

Larry Powers 
 
Get a bicycle.  You will not regret it if you live. - Mark Twain



 
> Date: Thu, 14 Jan 2010 12:02:46 -0800
> Subject: [RBW] Re: 32mm Tires on A Rambouillet
> From: [email protected]
> To: [email protected]
> 
> Ram # RB0453, SKS 45's, Open Pro rims, and the Shimano brakes that
> came with the bike. I've run GB30's and Pana Pasela 32's for the last
> three years. Clearances are tight, and if you're on chipseal you'll
> hear pebbles scrape by as they come round under the fender. In my
> experience, the SKS35's are too tight to run 30's or 32's, unless
> you're setting them up so that the centerline of the fender is maybe
> an inch or inch and a half away from the tire, putting the sides of
> the fenders far enough away from the sides of the tire to eliminate
> fender rub under high frame flex conditions like hillclimbing.
> Anyway, try as I might, I couldn't get the SKS35's that came with my
> Ram to work with the GB30's or PP32's.
> 
> Nick
> 
> On Jan 12, 11:35 pm, Larry Powers <[email protected]> wrote:
> > A couple of people have posted that they have run 32 mm tires on a 
> > Rambouillet.  I have run 30mm tires with 35mm SKS fenders and Shimano long 
> > reach brakes.  It was a very close fit using Grand Bois 30mm tires.  
> >
> > What brand tires have you used to do this?  It seems the height of the tire 
> > is the limiting factor so a round tire would work better then a tall oval 
> > shaped tire.  I have thought about experimenting with the wide mouth brakes 
> > to see what is possible.  Another thing I have wondered about is rims.  
> > Does a wide rim give a lower profile to the tire then a narrow rim?  My 
> > current wheels are built with Open Pro rims.  
> >
> > I would be very interested in hearing how you made this work and what type 
> > of fender/tire clearance you had.
> >
> > Larry Powers
> >
> > Get a bicycle.  You will not regret it if you live. - Mark Twain
> >
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