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Author Topic: tire sizes  (Read 8870 times)

minds4theye

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tire sizes
« on: July 01, 2009, 12:15:02 AM »

i am in the market for new tires and i am just wondering what kind to get.
right now i have pilot powers on there right now but am looking for something a little bit better. i have a 120/60 zr17 on the front and a 170/60 zr17 on the rear. i was looking at the pilot power 2ct's but they dont come in my size the closest i can find is 120/70 17 on the front and the rear is a 180/55 17.
can i use these tires on my 06 gt650r with out having any negative effects/ fitment issues. thanks

m4e
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IKYork

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Re: tire sizes
« Reply #1 on: July 01, 2009, 03:46:39 AM »

I can't find the article I read, but basically it says this: if you have a wheel designed for a particular size, say 160 in the case of the gt650, putting a larger tired on the rim will cause the tire to bow, changing the shape that hits the road. The larger the tire, the more this occurs and the more turning and stability are effected.

But in the case of the gt650, a 180 rear might not be too much of a stretch, however, I haven't tried yet. Anyone have any first-hand experience with a 180 rear on a stock wheel?
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minds4theye

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Re: tire sizes
« Reply #2 on: July 01, 2009, 06:23:27 AM »

ok sounds good but what about the numbers after the main number. the 55 or 60 or 70 what does that refer too??

m4e
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EbAgS

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Re: tire sizes
« Reply #3 on: July 01, 2009, 06:41:19 AM »

It refers to the 'profile'. I used to work in the automotive side of tyres so not sure how this relates to bikes but I'm sure its the same.

A tyre marked 160/65r17 means

160 is the width

65 is the profile of sidewall height. Its 65% of the width

17 is the rim size.

I've herd of guys using 160/70r17 as this is more common, but they had to lift the front fender up to avoid the tyre rubbing.

As far as I'm aware as stated already. Putting a larger tyre on the rear without using a wider rear rim will bow/distort the rear tyre and also slow the steering/turn in of the bike. This could somewhat be 'bought back' by pulling the forks up 5-10mm but your still going to have a tyre will a contact patch to the road distorted because its designed for a wider rim.

That said a 180 rear will physically fit on the rim and clear the swing arm, chain etc but its not highly recomended.
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minds4theye

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Re: tire sizes
« Reply #4 on: July 01, 2009, 06:48:56 AM »

well then i think i will stick with what sizes i have on there. i called around and found some metzler sporttec's.  does anyone have any info on how they like them. the price is good so i may get them.
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incman

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Re: tire sizes
« Reply #5 on: July 01, 2009, 07:27:08 AM »

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locko

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Re: tire sizes
« Reply #6 on: July 06, 2009, 05:06:23 AM »

180 is fine for the 650R ..i never had troubles, neither lack of "performance" lol
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EbAgS

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Re: tire sizes
« Reply #7 on: July 06, 2009, 06:15:20 AM »

Quote
180 is fine for the 650R ..i never had troubles, neither lack of "performance" lol

Is the 180 on a standard rim?? Did you notice slower turn-in/steering at all?
« Last Edit: July 11, 2009, 07:33:24 AM by EbAgS »
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Ian

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Re: tire sizes
« Reply #8 on: July 19, 2009, 05:19:31 AM »

A 170 isn't too much of size increase, would this have a bad effect if at all?  To the OP, what kind of difference did it make when you put on your 170.
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minds4theye

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Re: tire sizes
« Reply #9 on: July 19, 2009, 07:57:00 AM »

well i went with the pilot powers i have a 120 on the front and a 170 on the rear.  since i didnt change brands  i dont notice a big change, except when i lean into it. not that there is no flat spot on the tire it leans real easy now. im glad i moved to the mountains of nc, cause those straight fl. roads were killing me lol. i can actually use  the entire tread surface now. lol

m4e
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