Widest tire

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02 Feb 2023 19:30 - 02 Feb 2023 20:09 #879697 by carksz1b
Widest tire was created by carksz1b
Hello.... I am building a 77 kz1000a, I have a d.i.d wm6 (3.50x18) rear rim and want the widest tire i can fit with out rubbing the chain or brake stay. It had a 130/70-18 on it...

Thanks
Last edit: 02 Feb 2023 20:09 by carksz1b.

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03 Feb 2023 05:20 #879709 by urankjj
Replied by urankjj on topic Widest tire
I was running a 150/70-18 on the same bike and rim, (stock swing arm). It was a bit farther back in the swing arm due to sprocket sizes I believe. But I used to drag race it with low air pressure and had no clearance issues. Here's a comparison site,  good luck.... www.tacomaworld.com/tirecalc?tires=130-70r18-150-70r18

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03 Feb 2023 05:49 #879712 by Wookie58
Replied by Wookie58 on topic Widest tire
See below, what you go with will depend on what you use the bike for - going too wide on the tyre will potentially be ok in a straight line but may lead to interesting handling characteristics (sidewall flex) through the curves if you are a spirited rider

 
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06 Feb 2023 18:55 #879869 by Irish Yobbo
Replied by Irish Yobbo on topic Widest tire
Just a quick note - a wider tyre doesn't necessarily mean more rubber contacting the ground. If you put a much wider tire on the same rim as a narrower tyre, the wider tyre will have its sides pulled in more and give a pointier profile.

The same tyre on a wider rim will result in a larger contact patch as it 'spreads out' the tire giving a flatter profile.

I'd recommend sticking pretty close to stock - wider tyres on the same rim will usually not give better grip, but will give worse handling. If you're truly after more grip, changing to a wider rim with a tyre to match is the best way to go. If you don't want to change your rim, just get the stickiest tyre you can get.

1981 KZ750 LTD
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07 Feb 2023 19:18 #879893 by carksz1b
Replied by carksz1b on topic Widest tire
Yes wider,only straight line here

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09 Feb 2023 03:53 #879929 by slmjim+Z1BEBE
Replied by slmjim+Z1BEBE on topic Widest tire
Note that all tires marked as the same size vary somewhat in physical size (width & circumference) between manufacturers.  If a 130 tire from one manufacturer clears the hard bits by a few mm, a 130 tire from a different manufacturer might rub the hard bits or, might offer more clearance.

Irish Yobo is spot-on with the description of the disadvantages of a tire too wide for a rim. Tire width & rim width go hand in hand.  Tire manufacturers will state recommended rim widths for their their tire are designed.

Good Ridin'
slmjim & Z1BEBE

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