Tyre dilemma

blurredman · World Chat Champion Joined: 18 Sep 2010 Karma :

Okay.

In what difference would acceleration and speedometre reading suggest, if using a 100/100mm tyre rather than 100/90mm on 18" rims front and back?

I would prefer 90mm, but they don't seem to make any for 18" wheels...

Thanks.
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CBT: 12/06/10, Theory: 22/09/10, Module 1: 09/11/10, Module 2: 19/01/11
Past: 1991 Honda CG125BR-J, 1992 (1980) Honda XL125S, 1996 Kawasaki GPZ500S, 1979 MZ TS150.
Current: 1973 MZ ES250/2 - 18k, 1979 Suzuki TS185ER - 10k, 1981 Honda CX500B - 91k, 1987 MZ ETZ250 (295cc) - 40k, 1989 MZ ETZ251 - 51k.

Jim Mc · Nearly there... Joined: 28 Dec 2010 Karma :

Wow, just wow. You really can't work that out? Laughing

Think about it.

Moo. · World Chat Champion Joined: 11 Jan 2009 Karma :

Urm... what?

You've got it wrong. If it says 100/90. That means it has a 90% aspect ratio. The aspect ratio is the tread width to depth ratio.

100/100 would mean the width is the same as the depth
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A2 Passed 18/6/10

iooi · Super Spammer Joined: 14 Jan 2007 Karma :

If the old grey matter is struggling... Try here
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Just because my bike was A DIVVY, does not mean i am......

blurredman · World Chat Champion Joined: 18 Sep 2010 Karma :

I don't understand the system. Purely imperial man myself.

What kind of difference in size is a 100/100 over 100/90 ? Physically, how much of an inch large either side/taller etcc
____________________
CBT: 12/06/10, Theory: 22/09/10, Module 1: 09/11/10, Module 2: 19/01/11
Past: 1991 Honda CG125BR-J, 1992 (1980) Honda XL125S, 1996 Kawasaki GPZ500S, 1979 MZ TS150.
Current: 1973 MZ ES250/2 - 18k, 1979 Suzuki TS185ER - 10k, 1981 Honda CX500B - 91k, 1987 MZ ETZ250 (295cc) - 40k, 1989 MZ ETZ251 - 51k.

Rob W · World Chat Champion Joined: 09 Nov 2004 Karma :

100 is the width, and the 90 states that the tyre is 90% as high as it is wide.

I think...
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TS50 > Senda 125 > ZXR400 > CB-1 > GSX-R1000 > Bandit 600 > ZXR750 H1 > GSX-R750 SRAD > '98 RR-W Fireblade > T595 Daytona > Hornet 900 > '04 Fireblade > GSX-S1000F (x2) > '23 XSR900

blurredman · World Chat Champion Joined: 18 Sep 2010 Karma :

so the tyre would be 0.4 inches taller than a 90?

18" + 90mm (3.54") + 0.4 = 21.94"

VS

18" + 100mm (3.93") + 0.4 = 22.33"

In total diametre. That would be about equivilant to gearing up 1 tooth at the front right?
____________________
CBT: 12/06/10, Theory: 22/09/10, Module 1: 09/11/10, Module 2: 19/01/11
Past: 1991 Honda CG125BR-J, 1992 (1980) Honda XL125S, 1996 Kawasaki GPZ500S, 1979 MZ TS150.
Current: 1973 MZ ES250/2 - 18k, 1979 Suzuki TS185ER - 10k, 1981 Honda CX500B - 91k, 1987 MZ ETZ250 (295cc) - 40k, 1989 MZ ETZ251 - 51k.

MyCarVsYourHe... · Nova Slayer Joined: 27 Mar 2012 Karma :

Not even 1 up in the back I'd say.

blurredman · World Chat Champion Joined: 18 Sep 2010 Karma :

Ta
____________________
CBT: 12/06/10, Theory: 22/09/10, Module 1: 09/11/10, Module 2: 19/01/11
Past: 1991 Honda CG125BR-J, 1992 (1980) Honda XL125S, 1996 Kawasaki GPZ500S, 1979 MZ TS150.
Current: 1973 MZ ES250/2 - 18k, 1979 Suzuki TS185ER - 10k, 1981 Honda CX500B - 91k, 1987 MZ ETZ250 (295cc) - 40k, 1989 MZ ETZ251 - 51k.