They stop the tyre spinning on the rim and causing the valve to rip out of the tube, without it you allways get flat tyres.
Hey guys .Just a little technical correction.Rimlocks clamp the inner bead of the TYRE to rim.....It DEFINATELY DOES NOT clamp the tube to the rim[You would pinch the tube in 2 seconds flat doing that !!!!]
We dont want anyone trying to do that !!!
Cheers Brian.............
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