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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 11-14-2010, 01:24 AM   #1 (permalink)
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Mag Wheel Tire Options

First off, I tried looking in the archives for information specifically regarding tire options for the new Mag-Wheel Bonnies, and didn't find much. Also, i am new to riding and will need to buy new tires very soon as I have 9000 miles on my 2010 Black.

We all know the stock Tubeless Metzelers are the following dimensions:

Front Tire 100/70 R17
Rear Tire 130/80 R17

Looking at the image below from http://www.motorcycle-superstore.com I am a little confused by the tire width. does the "120" refer to the width of the outside bow of the tire, as the image seems to indicate? Or is it the width of the bead?



Also, how important is the Aspect Ratio when choosing a tire? For instance, on my bike, can I fit a 100/80 R17? Or will that cause problems? I ask this because the Avon AM26 Roadrider Front Tire only comes in 100/80V-17 through Motorcycle superstore. Are there any other reputable tire dealers you guys know of I can look at? Any dealers to beware of?

When I go to the Avon website, here is what they say they have:

http://www.avon-tyres.co.uk/motorbike/850-bonneville-se

850 Bonneville / SE / T100 / Sixty (2009 onwards)

Front tyre
Roadrider
Pressure front: 2.3 bar (33psi)
Front size: 110/70-17 (54V)

Rear tyre
Roadrider
Pressure rear: 2.7 bar (39psi)
Rear size: 130/80-17 65V

Anyone know where I can find the Front Tire size in the States? I will keep searching the web in the meantime.

The Avons look nice, but I am not dead-set on getting them. I am open to other suggestions and any tips I can get. I just think the Metzelers are too slick, and want something with more tread.

Thanks in advance
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Old 11-14-2010, 07:00 PM   #2 (permalink)
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So, out of the 58 people who viewed this thread, nobody has a mag-wheel Bonnie that they have replaced the tires on?
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Old 11-14-2010, 07:01 PM   #3 (permalink)
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Look here:http://www.tiresunlimited.com/ALL%20..._roadrider.htm
Avon RoadRider is a very commendable tire.
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Old 11-14-2010, 07:11 PM   #4 (permalink)
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Yes, but my conundrum is the numbers. Do I get the 100/80V17 or 110/70V17

The Metzelers are 100/70V17




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Old 11-14-2010, 08:04 PM   #5 (permalink)
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I'll be looking at this info with interest as I'll be in the same position in the early spring I figure...
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Old 11-14-2010, 10:15 PM   #6 (permalink)
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The stock front tire on my 2009 mag wheel is a 110/70 r17. i have about 6500 miles on mine and the front and rears are getting squared off pretty bad but there seems to be plenty of tread left. I'll be looking for tires next summer. I wouldn't mind a set of tires with some mild dirt capability or a fat front tire for looks but there doesn't seem to be many options in this rim size.

Keep us posted on what you end going with.
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Old 11-15-2010, 08:39 AM   #7 (permalink)
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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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Last edited by PAAS; 11-15-2010 at 08:44 AM.
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Old 11-15-2010, 09:26 AM   #8 (permalink)
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Quote:
Originally Posted by PAAS View Post
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).
I hate to disagree PAAS, this is copied & pasted from the Triumph site:

http://www.triumph.co.uk/usa/2010_Bo...onneville.aspx

Front Tyre100/70 R17
Rear Tyre
130/80 R17

There is the possibility the web-site is wrong, so I will take a snapshot of the tire when I go home for lunch. It is raining today here in GA, and I drove my cage to work. It is vexing that I cannot just run down to the parking lot and take a quick look

But I am pretty sure my front tire is a 100/70 17. Cause I took a pen & paper to the garage before I started searching the web for comparable replacements.
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Old 11-15-2010, 10:37 AM   #9 (permalink)
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I think you're getting a bit too deep into the exactness of the tire size replacement. Each tire maker has specifications for their products...for example, here's the pirelli tire range w/ specifications:

http://www.us.pirelli.com/en_US/brow...LI_FULL_07.pdf

All of the makers have similar information if you search it out on their websites. Look at the specifications table and you will see that there are allowable rim width ranges for each tire size. You can run any tire that will fit on your rim safely, but you should try and keep the rolling diameter somewhat close (assuming your speedometer is accurate). For example, if you have a 100/70-17 currently, you can run a 110/60-17 and not significantly change the rolling diameter.

From the pics of the mag wheel bonnies, it appears to me that there is plenty of fender clearance to go up a tire size as well. A 110/70-17 or a 120/60-17 would probably take up some of the gap...just check to make sure whatever you buy fits on the stock rim width.

Cheers,

--Rich
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Old 11-15-2010, 10:57 AM   #10 (permalink)
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Rich,

Thanks for the info, that is close to what I was looking for. Like I said, I am new to bikes, and this is the first time I have ever had to deal with a tire change. I have a mile-high understanding of the three size specs, but absolutely no frame of reference as to the impact of minor size changes when it comes to my bike.

I was going to buy my own tires and bring them to the dealer, but it looks as if i will have to rely on the dealer's expertise to ensure I don't get a tire that rubs, or otherwise negatively impacts my bike.
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