I don't know how things are in the UK but 110/150 tires are hard to come by in the US...price wise and vendor supply

I am switching for that reason. I am running a CBR F2 Rear wheel and Honda CBR F3 front. Reworked SP forks. I can get middleweight take offs for 100 USD for track days and such. Plus I can get Honda CBR F2/F3 wheels all day here in the states.

I will have a report on the set-up later in my build thread.
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1993 MC21 SP