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Shane Haverkamp
TryHard
nsw
soarer TT

Posts: 215
Reg: 10-2007

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 Friday, July 10, 2009 - 05:17 pm, by:  Shane Haverkamp (Havabeer) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)
hi everyone i recently bought a set of rims which are ziel 5 work 17 x 8.5

now the tyre size that are on the rims at the moment are 255/40/R17

on a few of the tyre websites i'm noting that these size tyres are for a 9" rim not 8.5 and that alot of 8.5" rims have 245 sized tyre

which size should i be going for on these rims. obviously the 255 fits but should i be going with a 245?

is there much of difference between the two?
David Vaughan
Goo Roo
NSW
V8 Ltd manual

Posts: 4483
Reg: 07-2005

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 Friday, July 10, 2009 - 05:35 pm, by:  David Vaughan (Davidv) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)
From my sources, a 9" rim would be ideal for your tyre but an 8.5" is fine (8.5-10 permissible).
A 245/45 tyre would be ideal for your rims, and would have 2.5% higher rollout (better cruising fuel economy).
Shane Haverkamp
TryHard
nsw
soarer TT

Posts: 216
Reg: 10-2007

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 Friday, July 10, 2009 - 06:32 pm, by:  Shane Haverkamp (Havabeer) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)
but would the speedo then be out by 2.5%?
David Vaughan
Goo Roo
NSW
V8 Ltd manual

Posts: 4484
Reg: 07-2005

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 Friday, July 10, 2009 - 07:20 pm, by:  David Vaughan (Davidv) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)
No, it would be more accurate by that margin. Currently it is optimistic, reading faster than you are travelling. With 245/45 it would be almost spot on.

This comparison is with 225/55R16 tyres which are pretty common on Soarers, especially TTs, but which themselves read slightly optimistically compared with 215/60R15 sometimes fitted to V8s.
Damian Ware
Goo Roo
Victoria
UZZ32

Posts: 1027
Reg: 10-2005

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 Saturday, July 11, 2009 - 09:56 am, by:  Damian Ware (Frozenpod) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)
From my experience most 255's fit perfectly on an 8.5" rim and the speedo will slightly over read but will be within the 3% tolerance.

My new tyres that I have ordered (fitted next week) I am going to be running 255/40R17 and 275/40R17. Note I do realise the 275/40R17 is a little taller than the 255's and I wanted this, hopefully should improve the balance.
Shane Haverkamp
TryHard
nsw
soarer TT

Posts: 217
Reg: 10-2007

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 Sunday, July 12, 2009 - 06:51 pm, by:  Shane Haverkamp (Havabeer) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)
what brand of tyre are you using for the 255/40/r17? and how much are they costing you?

i only ask because i ordered a set of faulkan's in that 255 size for $275 each

but there's a sale on firestones in 245/45

http://www.bobjane.com.au/tyreset-details/tyresetID/248/idm/17/ispt/Tyres/isu/7.html

for 209 each
Shane Haverkamp
TryHard
nsw
soarer TT

Posts: 218
Reg: 10-2007

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 Sunday, July 12, 2009 - 07:40 pm, by:  Shane Haverkamp (Havabeer) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)
this was posted on a different forum

225/55/16 = 653.9mm dia (soarer factory)
245/40/17 = 627.8mm dia
255/40/17 = 635.8mm dia
235/45/17 = 643.3mm dia (common front tire size to run)

255/40's will be closer to your factory rolling diameter.
the closer to this size (653.9mm) the more accurate your speedo will read.
Damian Ware
Goo Roo
Victoria
UZZ32

Posts: 1033
Reg: 10-2005

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 Sunday, July 12, 2009 - 07:50 pm, by:  Damian Ware (Frozenpod) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)
What do you expect to pay for tyres??

Looking at top quality tyres in that size paying over $400 is not uncommon.
David Vaughan
Goo Roo
NSW
V8 Ltd manual

Posts: 4485
Reg: 07-2005

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 Sunday, July 12, 2009 - 09:08 pm, by:  David Vaughan (Davidv) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)
The alternative mentioned was 245/45R17, not 245/40. The former is 652 mm which is closer than 255/40, as I described above.

in fact, 245/40R17 would be illegal, more than 3% out.
Shane Haverkamp
TryHard
nsw
soarer TT

Posts: 219
Reg: 10-2007

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 Sunday, July 12, 2009 - 11:26 pm, by:  Shane Haverkamp (Havabeer) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)
ok then.

i'll stick with my ordered falken tyres.

thanks for all the help. just cant get my head around tyre sizes

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