That is why I specified conditions as I did, a triple front ring derailleur setup. I figured it would be about the commonest Xtracycle drivetrain.
Even with an IGH drive the chain line can vary considerably between hub makes which will affect tire width limits. Based on comments so far it looks like the 2.35" width Big Apple is right at the limit for a standard configuration Big Dummy. I would presume similar limits would apply to a Xtracycle converted MTB with a stock triple drivetrain.
I am happy with 2" tires on my BD and see no need to go wider. My post was done as a possible aid to others on what the nominal tire width limit would be for a usual Xtracycle MTB conversion or factory built Big Dummy.
--- In email@example.com, "speedub_nate" <speedub.nate@...> wrote:
> Rich, it depends on whether you're running a rear derailleur & cassette, or an internal gear hub, and whether or not you've got a front single or triple and, if single, what its spacing is.
> --- In firstname.lastname@example.org, "Rich" <astronut1001@> wrote:
> > Does anyone know from experience what the widest tire is that can normally be fitted to an Xtracycle or Big Dummy before chain to tire clearance becomes a problem in the lowest gears on a triple chainring derailleur setup?