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Is there any way I can run a modern tapered 1 1/2" to 1 1/8" tapered suspension fork on a 2003 Surly Karate Monkey (Original frame style with V-brake and Disc Brake Mounts). I think it only works with 1 1/8" straight steerer forks now. Are there any headsets that I could install which would make my frame compatible with a modern tapered suspension fork?

FWIW, I'm currently running a Chris King No Threadset for straight steerer at 1 1/8" diameter.

  • Looking for an adapter solution, if all else fails, I'll resort to finding a straight steerer 1 1/8" suspension fork. – Benzo Jul 30 '15 at 13:59
  • I have seen a headset that'll do this, can't find it now though. – alex Jul 30 '15 at 14:08
  • But, in the end I just bought a 1 1/8" fork. Just had a look and there seems to still be plenty of choice in forks. – alex Jul 30 '15 at 14:21
  • Been looking at cane creek conversion headsets, but they seem only to be appropriate for 44mm headtubes like on the newer karate monkey ops. I have an older model which is likely the old style 34mm headtube for only 1 1/8" straight steerer forks. – Benzo Jul 31 '15 at 15:33
  • I think you're out of luck then. Go for a 1 1/8, there are loads, any conversions you find are going to add to the height and your frame is only meant to take a 70mm form as it is. – alex Jul 31 '15 at 15:38
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Beyond rebuilding the frame with a tapered headset, not practical.

Effectively you need to fit an 1.5" OD tube into a 1.125" ID hole. This could theoretically be done by using a spacer and locating the taper part of the steerer under the frame.

The effect would be raise the headset height and change the bikes geometry. The advantages of the tapered headset would be negated very quickly by the changed geometry, and the loss of stiffness and extra weight using a spacer would offset all the advantages of a tapered headset. i.e. The bike would be less stiff, heavier and have a poorer geometry.

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