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The Garage Motorcycle Related Discussion (Yamaha XS650, other makes and models, and anything else motorcycle related including tools and gear)

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Old 01-21-2010, 12:38 AM   #1
cheftay
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Default Correct tire size

I've been doing my research on tires and sizes and just wanted to make sure i'm making the right decision before I purchase them.

For my front tire I'm thinking the Dunlop K81/TT100GP 100/90H19 TL
and For my rear, the Dunlop K81/TT100GP 110/90H18 TL

Does that sound right?

Thanks!

.cheftay


1971 XS1B - almost restored
1975 XS650 - basket case - cafe build
1980 XS650 - basket case - bobber build
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Old 01-21-2010, 08:22 AM   #2
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Default Re: Correct tire size

Where are you buying the GPs from? Every place I've looked at in the U.S. carries the TT100, but not the TT100GP. Thanks.


1977 Yamaha XS650D
1981 Yamaha XV920RH
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Old 01-21-2010, 10:06 AM   #3
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Default Re: Correct tire size

Wellll...
In my research I guess the thing i overlooked was that I was on an australian site the whole time and now that I double checked, they don't ship to the U.S.

bummmmer!

the site was teammoto.com.au

How do the TT100 compare?

Thanks
.cheftay


1971 XS1B - almost restored
1975 XS650 - basket case - cafe build
1980 XS650 - basket case - bobber build
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Old 01-21-2010, 10:29 AM   #4
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Default Re: Correct tire size

From this website:

http://www.dunloptyres.com.au/TyreDe...&from=nPerPage

I asked the following question through the 'Contact Us' link:

"What are the differences between the TT100 tire sold in the United States and the TT100GP tire sold in other countries?"

and got this reply:

"Hi Wade
There will be no difference. They all come out of the same factory to the same specs.

Please note there are 2 versions available in Aust
a. TT100 GP Special soft race comp
b. TT100 / K81 standard compound

It is easy to identify the difference by the description on side wall & the way they are sized

rgds
Ken Wieden
National Motorcycle & Motorsport Manager
Dunlop Tyres
Tel 03 84167225
Mob 0419 253976
Fax 03 84167400
email ken_wieden@goodyear.com"

I replied to his message a little while ago and asked if there were any retailers in the U.S. that were selling the TT100GP. I'll post the response when I get it. Thanks.


1977 Yamaha XS650D
1981 Yamaha XV920RH
1980 Kawasaki KZ440
1975 Suzuki TS125
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Old 01-21-2010, 10:47 AM   #5
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Default Re: Correct tire size

Dang that's good news.
Bikebandit.com is having a big sale on their TT100's, they dont have the 110/90-18 that I need for my rear tire.
http://www.bikebandit.com/dunlop-tt1...otorcycle-tire

Thanks a lot!
.cheftay


1971 XS1B - almost restored
1975 XS650 - basket case - cafe build
1980 XS650 - basket case - bobber build
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Old 01-21-2010, 06:33 PM   #6
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Default Re: Correct tire size

I've got 18" gp's front & back, the rear is a 4.00-18, front is a 90/90 H18
I tried a 4.00 on the front once (I wasn't able to get a 90/90) man the thing was horrible to steer, like a tractor!

Yes, there are some sizing differences between the gp's & the std range. No doubt the road range would last a lot longer than the gp's also!
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Old 01-21-2010, 06:55 PM   #7
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Default Re: Correct tire size

dang I can't imagine having a 4.00 in the front.

I would like to get the gp's but i'm gonna look around at other tires too.

I've got a 19" rim in the front and 18" in the back( stock wheels)...
Does it sound like I have the right size in mind: 100/90-19 for the front and 110/90-18 for the back?


1971 XS1B - almost restored
1975 XS650 - basket case - cafe build
1980 XS650 - basket case - bobber build
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Old 01-21-2010, 07:14 PM   #8
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Default Re: Correct tire size

100/90 would be ok, 90/90 will steer better, even 80/90 would be ok!
Yep, rear sounds good to me, a 4.00-18 would be just as good.
Here's a conversion chart

http://www.totalmotorcycle.com/photo...e-TyreTech.htm
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Old 01-21-2010, 07:22 PM   #9
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Default Re: Correct tire size

Looks like they might have a 4.00-18 for the rear there!

http://www.bikebandit.com/dunlop-k70...otorcycle-tire
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Old 01-21-2010, 09:53 PM   #10
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Default Re: Correct tire size

Oh sweet!

Do i need to worry about the tires width being too small if i were to go to a 90/90 or even an 80/90 for the fronts?


1971 XS1B - almost restored
1975 XS650 - basket case - cafe build
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Old 01-21-2010, 10:10 PM   #11
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Default Re: Correct tire size

I've never tried a 80, I can vouch 100% for a 90/90, no problem!
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Old 01-21-2010, 10:28 PM   #12
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Default Re: Correct tire size

Well good deal!

It looks like the TT100's on bikebandit.com aren't available in 90/90-19 but the K70's have a 3.25-19.

The K70s are tube type tires and the TT100's are tubeless... can I do either one?

It'd help if I had my bike near me so I could see what I have on it right now but I'm doing all this research from a hotel room in CO haha...

Thanks!

.cheftay


1971 XS1B - almost restored
1975 XS650 - basket case - cafe build
1980 XS650 - basket case - bobber build
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Old 01-21-2010, 10:34 PM   #13
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Default Re: Correct tire size

I take it you were planning on running tubes anyway? But yeah, no problem either way. The only time you really have trouble with tubes is either putting tubes in a radial tyre (DON'T do this without fuuly researching) or people thinking their busted arse old 650 mags are designed for tubeless (many are NOT)
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Old 01-21-2010, 10:45 PM   #14
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Default Re: Correct tire size

Hmm okay that makes sense.
I wasn't really planning on running tubes per say, just whatever is best If you know what I mean.


1971 XS1B - almost restored
1975 XS650 - basket case - cafe build
1980 XS650 - basket case - bobber build
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Old 01-21-2010, 11:17 PM   #15
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Default Re: Correct tire size

Well tubes are fine, most on XS's will be running tubes. what rims have you got?
Ultimately tubeless are best, but of course that depends on evrything else!
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Old 01-21-2010, 11:25 PM   #16
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Default Re: Correct tire size

The rims are the original spoked wheels.

Front rim size: 1.85Bx19
Rear rim size: 2.15Bx18


1971 XS1B - almost restored
1975 XS650 - basket case - cafe build
1980 XS650 - basket case - bobber build
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Old 01-22-2010, 12:49 AM   #17
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Default Re: Correct tire size

Yep, well you'll be needing tubes anyway then. Spring for a new pair of rustbands while your at it
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Old 01-22-2010, 12:52 AM   #18
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Default Re: Correct tire size

Super Duper!

Thanks a lot Yamaman!


1971 XS1B - almost restored
1975 XS650 - basket case - cafe build
1980 XS650 - basket case - bobber build
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Old 01-22-2010, 12:55 AM   #19
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Default Re: Correct tire size

18" Tyres Permitted Rim

250*18 tyre 1.40/1.60 rim

275*18 tyre 1.40/1.60/1.85 Rim

300*18 tyre 1.60/1.85/2.15 Rim

360*18 tyre 1.85/2.15 Rim
80/100*18

325*18 tyre 1.85/2.15/2.50 Rim
350*18
375*18
410*18
90/90*18
100/80*18
100/90*18
100/100*18

460*18 tyre 2.15/2.50/2.75 Rim
110/100*18
120/80*18

400*18 tyre 2.15/2.50/2.75/3.00 Rim
450*18
110/80*18
110/90*18
120/90*18
120/100*18

510*18 tyre 2.50/2.75/3.00 Rim

130/80*18 tyre 2.50/2.75/3.00/3.50 Rim
130/90*18
140/80*18

130/60*18 tyre 3.00/3.50/4.00 Rim
130/70*18

140/60*18 tyre 3.50/4.00/4.50 Rim
140/70*18
150/60*18
150/70*18

160/60*18 tyre 4.00/4.50/5.00 Rim

19" Tyres Permitted Rim

275*19 tyre 1.40/1.60/1.85 Rim
70/90*19

300*19 tyre 1.60/1.85/2.15 Rim
360*19

325*19 tyre 1.85/2.15/2.50 Rim
350*19
410*19
90/90*19
90/100*19
100/90*19

110/90*19 tyre 2.15/2.50/2.75 Rim
120/90*19


Last edited by yamaman; 01-22-2010 at 01:47 AM.
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Old 01-22-2010, 01:06 AM   #20
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Default Re: Correct tire size

Woah that's a lot of numbers!

I think i'll go with the dunlop k70's.. bike bandit has a good price for them right now


1971 XS1B - almost restored
1975 XS650 - basket case - cafe build
1980 XS650 - basket case - bobber build
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