Main Motorcycle: 2010 Bonnie Black MAG
Join Date: Mar 2010
Location: Johns Creek Georgia
Other Motorcycle: Dreaming of an Explorer
Extra Motorcycle: Dreaming of a KTM
|Air Cooled Twins Technical Talk Technical Talk for Hinckley Triumph Twins: Bonneville, T100, Speedmaster, America, Thruxton, and Scrambler.
Sponsored by: Triumph Twin Power Ltd
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Are you sure you haven't mis-read the sidewall of your front tyre? According to Triumph's website the cast wheeled Bonnies come with a 110/70 front tyre. This is also the recommended fitment on the Metzeler website and they don't list a 100/70 MEZ4. I'm pretty sure I've seen a 110/70 MEZ4 fitted to the bikes I've looked at. Can't say I'm overly impressed by Avon lumping the T100 and Sixty in with the Bonneville and SE so that their recommended fitment for those bikes is a 17" tyre that won't fit their 19" wheels! I would stop looking for a 100/70 x 17" and just go with the 110/70, it'll be fine. The width of the tyre is the widest part as shown by the image you posted above. The bead will be narrower - a 110 tyre is about 4.33" wide and you're fitting it to a 3" wide wheel so the bead width will be somewhat nearer to 3" (but still a bit wider).
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