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Correct me if I'm wrong, but having a smaller back tire would make your engine rpm's rise a touch since the tire would cover less distance with each turn. If we're just talking about changing the back tire, the speedo would not be affected, as that's on the front wheel. However if you also change the front, the speedo would be even more hopeful than it is now, because the wheel would be spinning slightly faster at the same forward speed, indicating a higher speed. I'm not sure how drastic of a change it would actually be though and you might not notice a whole lot.
I'm interested in how close to accurate putting a 100/90-16 on the front will make the speedo, as I just put an order on a new set of BT45's
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