One thing I have found useful during my fat tire experiments is to use
Sheldons gear calculator for gain ratios to keep the playing field
equal.  Helps to keep you from blowing a gasket during the transition
to running fat tires.  For example cruising gear on my:

Eisentraut - 53:28 w/ 28mm RoughyToughy
Roadeo - 50:18 w/ 33mm Jack Browns
Rawland - 44:16 w/ 42mm Marathon XR

The gain ration is pretty close in all cases.  Just food for thought
Also, the big apple rock, I have them on our tandem

Rob



On Mar 18, 10:57 am, Michael_S <mikeybi...@rocketmail.com> wrote:
> I've been toying with the idea of getting the 700x 50's for my
> Hillborne. I think they would fit without fenders. I have 40mm Smart
> Sams on it now and there is an easy cm on each side of the rear tire
> to the chainstay.
> ....and living in SoCal, fenders are not needed most of the year.
>
> ~Mike~
>
> On Mar 18, 10:31 am, Esteban <proto...@gmail.com> wrote:
>
>
>
> > I love the idea of a very fat tired road bike.  Fun!  I wish there was
> > a big apple in 650B.
>
> > If only this fellow could have fit fenders in there, as it rained
> > rather hard for the whole event here in San Diego.  I heard stories
> > from friends that moments into the ride, MCRB riders were dropping out
> > like flies because of the conditions (rain!) and that people riding in
> > peletons had mouthfuls of road grime.
>
> > Esteban
> > San Diego, Calif.
>
> > On Mar 18, 10:26 am, "Jim M." <mather...@gmail.com> wrote:
>
> > > That's a Ritchey Carbon Mountain Fork -- you can see the disc brake
> > > mounts. That's why it can handle the fat tires. Everyone knows that's
> > > a 26" MTB frame and not a road frame, right?
>
> > > jim m
> > > wc ca
>
> > > On Mar 18, 10:18 am, Bill Connell <bconn...@gmail.com> wrote:
>
> > > > On Thu, Mar 18, 2010 at 12:02 PM, Jeremy Till <jeremy.t...@gmail.com> 
> > > > wrote:
> > > > > Seems like the MC/ARB crowd is starting to get the "fat tires on the
> > > > > road" thing, albeit in a bit more "extreme" way:
>
> > > > >http://redkiteprayer.com/wp-content/uploads/2010/03/IMG_0876.jpg
> > > > >http://redkiteprayer.com/wp-content/uploads/2010/03/IMG_0877.jpg
>
> > > > > Makes a jack brown look like a wispy track tire.
>
> > > > > (from RKP's Grand Fondo Colnago report...guess the guy was a belgian
> > > > > who had flown in for the event.  Come to think of it, that bike would
> > > > > be awesome for rocking some flandrian cobblestones)
>
> > > > Those tires look great. Impressive that the carbon fork he's using can
> > > > handle those wide tires, but i can only imagine the road spray those
> > > > things would throw up. A ride like that calls for fenders!
>
> > > > --
> > > > Bill Connell
> > > > St. Paul, MN- Hide quoted text -
>
> > - Show quoted text -- Hide quoted text -
>
> - Show quoted text -

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