Calzone
Gear Whore #1
Phil,
On the Mountain Trials it might be so slight that any difference does not matter. I have both vintage Speed Springs and newer Steed Springs made by SRP. They don’t have the sag the elastomers they replace had.
Also I checked the Judy XL clearance on the Ti IBIS and it will clear the frame when turned at a 90 and beyond. Don’t know if there is a geometry change, but know that there are other subtle differences between the same sized bikes. First off the Ti IBIS has vertical dropouts on the rear, and the steel IBIS has horizontal drops.
Next the wheelbase is a maximum of 39 1/2 inches on the steel IBIS with the horizontal drops set to the greatest length. Meanwhile the Ti IBIS wheelbase measures 40 inches and of course is not adjustable.
I have a straight bladed fork that is a third type of IBIS fork that they use on their tandems that came on my bike.
I had Steve Pots make me an IBIS Type 2 matching the length of the IBIS tandem forks. I know IBIS used Koski forks and they are shorter than my tandem fork.
My experience with the Rock Shox Judy SL on the Ti Basso back in the day is that the chopper like effect on a retro frame not initially built for a suspension is mucho lame and slows down the steering too much. The effect though on my steel IBIS seems unmeasurable because it had this longer fork. I imagine the very early Mountain Trials with the Koski forks to be more hyper and twitchy.
Cal
On the Mountain Trials it might be so slight that any difference does not matter. I have both vintage Speed Springs and newer Steed Springs made by SRP. They don’t have the sag the elastomers they replace had.
Also I checked the Judy XL clearance on the Ti IBIS and it will clear the frame when turned at a 90 and beyond. Don’t know if there is a geometry change, but know that there are other subtle differences between the same sized bikes. First off the Ti IBIS has vertical dropouts on the rear, and the steel IBIS has horizontal drops.
Next the wheelbase is a maximum of 39 1/2 inches on the steel IBIS with the horizontal drops set to the greatest length. Meanwhile the Ti IBIS wheelbase measures 40 inches and of course is not adjustable.
I have a straight bladed fork that is a third type of IBIS fork that they use on their tandems that came on my bike.
I had Steve Pots make me an IBIS Type 2 matching the length of the IBIS tandem forks. I know IBIS used Koski forks and they are shorter than my tandem fork.
My experience with the Rock Shox Judy SL on the Ti Basso back in the day is that the chopper like effect on a retro frame not initially built for a suspension is mucho lame and slows down the steering too much. The effect though on my steel IBIS seems unmeasurable because it had this longer fork. I imagine the very early Mountain Trials with the Koski forks to be more hyper and twitchy.
Cal