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@declan If your going from a 110 to a 120, that just means its wider by about 10mm, as the other dimensions are the same. The wider tyre may cross the chain line, causing the chain to cut into the tyre. Or the wider tyre may snag on the swing arm? It all depends on how much clearance there is around the chain line and swing arm dude ???
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@declan Fit em and see if they snag ??? If they do or there's not much wiggle room, then just start her up, tilt the bike over and do some burn outs on either side to wear a bit of rubber off !!! Not the best idea, but a problem fixer for-sure !!!
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80/100 front is fine, its 1cm narrower, thats it.
In general, you can go up and down one notch in size compared to stock with no problems. -
@jens-eskildsen thanks