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Twins Technical Talk Technical Talk for Hinckley Triumph Twins: Bonneville, T100, Speedmaster, America, Thruxton, and Scrambler.

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Old 11-20-2012, 06:26 PM   #1 (permalink)
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Max Tire Size on Bonnie

I have to replace the tires this winter on my 08'bonneville. It has the original spoked rims, which I'm looking to put some thicker and taller sidewall tires on.

I like the look of these tires but this guy changed out his wheels.


What sort of handling changes would occur, anything major? If someone can give me some specs as to what the largest I can go would be it would be greatly appreciated.

Has anyone fit the bridgestone spitfires on their bonnie?
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Old 11-20-2012, 09:35 PM   #2 (permalink)
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With the stock rims, I ran Metzeler ME880 tires, with a 140-80/17 on the rear, and a 110-90/19 on the front. They looked beefy enough and performed excellently. I had to trim down the four bolts that attach the front fender to the big steel fender bracket to avoid them cutting into the 110 front tire, but that was it. An added benefit is that the ME880 has great longevity and excellent grip.

There are a couple of 150-series tires that will fit on your stock rear rim, but I'm unsure of the specifics.
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Old 11-21-2012, 12:23 AM   #3 (permalink)
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Within reason, 140/80-17 on the rear. Many people put a 150 back there and while it looks nice, there are some contact patch/reduced traction issues. As for the front, I have a 120/70 on there now but i think the best looking is either a 110/80 or 110/90. My front wheel is a 17 though (mag wheel bonnie)
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Old 11-21-2012, 11:40 AM   #4 (permalink)
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Quote:
Originally Posted by cashmore1985 View Post
Within reason, 140/80-17 on the rear. Many people put a 150 back there and while it looks nice, there are some contact patch/reduced traction issues. As for the front, I have a 120/70 on there now but i think the best looking is either a 110/80 or 110/90. My front wheel is a 17 though (mag wheel bonnie)
nope I have had 140/80 and 150/70 on the rear the 150/70 has more tire on the road.
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Old 11-21-2012, 03:11 PM   #5 (permalink)
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nope I have had 140/80 and 150/70 on the rear the 150/70 has more tire on the road.
From what I understand, the contact patch when putting a 150/70 on a 3.5" rim becomes wider left to right but shorter front to back.
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Old 11-26-2012, 11:52 AM   #6 (permalink)
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if you are willing to upsize your rim width $$$$ for proper fitment do some measurments for clearance then go to a tyre site michelin has full specs as a pdf download, gives diameters, section widths etc, also recommended fitment for rims and tyre combos, some tyres grow a little when hot or at speed, you will see radials require more rim, lower profiles are lighter enhanching handling, reasons for aluminum wire wheel rims or lighter aftermarket mag styles. used wider 18" wheels with mich radials on sportster, stock front 100/90/19 2.5"rim replacement 120/70/18 3.5" rim rear 150/80/16 3"rim replaced with 160/60/18 4.25" rim mich pilot road II tyres handling EXCELLENT!!!!
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Old 11-27-2012, 10:16 PM   #7 (permalink)
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Dunlop 501, 150-17 will fit on the rear rim.
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Old 11-27-2012, 10:52 PM   #8 (permalink)
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I went wide (150 rear GT501) on OEM rims. It can be done but the resultant slower cumbersome handling was not a compromise I was willing to accept. I pretty well only ride mountain curves so quick nimble handling is important to me. It may be a different matter for those commuting or predominantly riding highways.
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