cycles per second
Join Date: Oct 2003
Bikes: Vitus Aluminum, DiamondBack Apex, Softride Powerwing 700, "Generic" Ishiwata 022, Trek OCLV 110
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If the frame is steel, I'd say go for it. If aluminum or titanium, I'd get the headtube reamed out to 30.0mm for the 30.2mm cups. If carbon fiber, I'd stick with a JIS headset.
I once put ISO headset cups into my old steel MTB and didn't realize it used a JIS headset until I tried to put the 26.4 ISO crown race on the fork.