Can anyone out there who has done this modification advise on the best way to go about it.

Do the twinshock yokes need machining to fit the mono forks or can the mono stem be modified to accept the twinshock head bearings.

Cheers

dougalthedog

I had my twinshock yokes bored out to accept the mono forks, don't forget you need the mono wheel as well. I think you can do it using the mono yokes but it's a rigmarole. Woody knows more about it than me, he may be along soon.

Far from an expert on this but how you do it is down to your available abilities and resources.

Boring out the standard yokes seems to be the most common way. This is difficult to do whilst retaining the standard offset I am told (by offset I man the angle the forks run at in relation to the stem, not strictly offset but it will do) However I guess you could bore them parrallel to the stem which is easier, as the mono forks are leading axle you could afford to reduce the head angle slightly.

You can try pressing out the mono stem and replacing it with the t/s one. You may would have to bore out the mono bottom yolk to do this as the ID on the t/s bearing is much bigger, can't remember about the top bearing but you get the idea of what is involved.

I think to fit the mono yokes complete may be difficult due to the odd bearing sizes. You'll have to measure up what you need and then you could phone pyramid parts (they have a website) who stock odd bearing sizes. They actually do taper rollers for the t/s so it's possible they could supply bearings that would fit the mono stem in the t/s. Or you may have to make up sleeves or collars for the bearings to get them to fit.

Whichever way you do it it is a bit of a job that is probably going to need engineering skills somewhere along the way.

just thinking outloud so if its a silly idea let me know

Would it not be easier to have the mono stem machined to the same diameter (at the bearing positions) and length as the original twinshock one in order to accept the twinshock bearings. This would surely enable a straight forward fit with only the stem requiring modification. I am assuming the mono stem is thicker than the twinshock one - havent compared the two !!

Thanks Woody, I couldn't remember what was involved using the mono yokes.

As I said I had the t/s yokes bored out (cost me