Tried them this morning and still no luck. They suspect that there may not be the clearance for an 18T.
Thats excellent advice...I always wondered what the difference was with altering the front v the rear.As a rule just remember the following when making any changes to gear ratios:
Gearing a bike up to produce higher top speed with less acceleration is done using a larger front sprocket or a smaller rear sprocket.
Gearing a bike down giving it more acceleration with lower top speed is done using a smaller front sprocket or a larger rear sprocket.
Generally speaking changing one tooth on the front sprocket has a significantly larger effect on the gearing than changing one tooth on the rear sprocket. To make only a small change in gearing it is therefore necessary to change the rear sprocket size by one tooth, as changing the front sprocket makes a far larger difference in gearing.
You may not always have to reduce the number of links when altering gear ratios but bear in mind a reduction in chain length may positively, or negatively, alter wheelbase. For the 2015/16 model retaining a longer wheelbase is preferential.
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