Discussion
Afternoon all,
First of all many thanks to all those who offered advice when I last enquired. I have finally ordered my new wheels (Griff 500se) and taken the wheel manufactureres advice and gone with a rear of 18 x 9J at 42mm offset and a front of 17 x 8J with 25mm offset.
They are recommending 245 x 35 for rear tyres. However, I wondered if anyone has any experience of fitting a 255 tyre on the rear of a griffith?
I would like to preserve as much sidewall as possible and assume that a 255 x 35 will 'give' a little more than a 245x35 providing it does not foul anywhere.
Any thought? Appreciated as always.
The Griffith project is coming on nicely and I will post some pictures when finished.
Many thanks
Stilly
First of all many thanks to all those who offered advice when I last enquired. I have finally ordered my new wheels (Griff 500se) and taken the wheel manufactureres advice and gone with a rear of 18 x 9J at 42mm offset and a front of 17 x 8J with 25mm offset.
They are recommending 245 x 35 for rear tyres. However, I wondered if anyone has any experience of fitting a 255 tyre on the rear of a griffith?
I would like to preserve as much sidewall as possible and assume that a 255 x 35 will 'give' a little more than a 245x35 providing it does not foul anywhere.
Any thought? Appreciated as always.
The Griffith project is coming on nicely and I will post some pictures when finished.
Many thanks
Stilly
Do you have 4 stud hubs? If so the et42 with 9x18 is too high if you're planning to run 245/35 tyres. That tyre size is the correct conversion from stock sizes but that offset would bring the wheels too far in effectively reducing the track. If you went up to 255 or 265 you would counteract the effect of the "wrong" offset to fill the arch and effectively restore the tyre track (because the tyre centres would still be the same the theoretical track would still be reduced).
8x17 for the front seems too wide also - especially with et25. What tyres are you planning to run?
Clearly your car project may enable you to adapt your car to cater for sizes and specs outside the norm but be careful... wheel manufacturers/ suppliers will often tell you that it will fit... whether it's right (or can be made to be right) is another matter altogether. Are you sure their wheel recommendation is based on a knowledge of these cars and/or what you're doing, rather than simply offering what they happen to have available (which so far doesn't sound like it's the best thing for the job)?
8x17 for the front seems too wide also - especially with et25. What tyres are you planning to run?
Clearly your car project may enable you to adapt your car to cater for sizes and specs outside the norm but be careful... wheel manufacturers/ suppliers will often tell you that it will fit... whether it's right (or can be made to be right) is another matter altogether. Are you sure their wheel recommendation is based on a knowledge of these cars and/or what you're doing, rather than simply offering what they happen to have available (which so far doesn't sound like it's the best thing for the job)?
I ran the same size wheels,those offsets sound about what I had,but I can't remember for sure.265/35/18 is what I ran on the back and would get a slight rub on the big bumps.
With the fronts I ran 235/40/17,on full lock i'd get a small rub on the inner arches,bit if your going into full lock at speed,your going to be in the shite anyway.
225/40 would of been ideal but no one makes a tyre that size.
Go for the Good years F1's,you won't believe the difference in grip,even better if you have your suspension well tuned.
With the fronts I ran 235/40/17,on full lock i'd get a small rub on the inner arches,bit if your going into full lock at speed,your going to be in the shite anyway.
225/40 would of been ideal but no one makes a tyre that size.
Go for the Good years F1's,you won't believe the difference in grip,even better if you have your suspension well tuned.
Thanks chaps,
Well I seem to have established that a 255/35/18 will fit the rear arches. also that there is not a 225/40/17 avaialble. The car currently runs on 225/45/16 fronts so I guess that the nearest is a 235/40/17 - I will probably go for these as I do not want to go to a more narrow tyre (215/40/17).
SP - thanks for your input - the wheel manufacturer (Compomotive) has done 'tons' of work with TVR and supplied TVR Tuscan challengge wheels both here and in Malaysia. They were extremely helpful but I will check again about the offsets before diving in as this is not the advice I have seen having a really good search on the threads going back to year dot!
V8 Sag, thank you also - encouraging that someone has tried this set up already - was it on a Griff and how was it? If I understood you correctly you would actually go down to 215 though?
the car has been very well set up on adjustable Nitrons and drop links by Track Car who has advised me to leave well alone!
However, I really want a Griff that fills its arches with wheel and tyre and really 'sits' properly.
Any more advice really appreciated. Weirdly another P/H poster has the Comp wheels on his Chim and the factory gave him a completelty different spec.....
Well I seem to have established that a 255/35/18 will fit the rear arches. also that there is not a 225/40/17 avaialble. The car currently runs on 225/45/16 fronts so I guess that the nearest is a 235/40/17 - I will probably go for these as I do not want to go to a more narrow tyre (215/40/17).
SP - thanks for your input - the wheel manufacturer (Compomotive) has done 'tons' of work with TVR and supplied TVR Tuscan challengge wheels both here and in Malaysia. They were extremely helpful but I will check again about the offsets before diving in as this is not the advice I have seen having a really good search on the threads going back to year dot!
V8 Sag, thank you also - encouraging that someone has tried this set up already - was it on a Griff and how was it? If I understood you correctly you would actually go down to 215 though?
the car has been very well set up on adjustable Nitrons and drop links by Track Car who has advised me to leave well alone!
However, I really want a Griff that fills its arches with wheel and tyre and really 'sits' properly.
Any more advice really appreciated. Weirdly another P/H poster has the Comp wheels on his Chim and the factory gave him a completelty different spec.....
Brave man to go against Jools (Trackcar) advice IMO.
Why not stick with 245 rear and 225 front if PAS?
As you'll have to maintain the rolling circumference to keep your speedo/odometer right the wheel/tyre combination won't fill the arches any more anyway!
Ricardo
Why not stick with 245 rear and 225 front if PAS?
As you'll have to maintain the rolling circumference to keep your speedo/odometer right the wheel/tyre combination won't fill the arches any more anyway!
Ricardo
Edited by Ricardo Bertone on Monday 4th December 19:24
Ricardo,
Jules didnt advise against the tyre width - he advised against touchng the wheels and tyres full stop!
I was happy to go with 245 r and 225 f but there is not a 225/40/17 tyre avaialable - not too bothered about roling radius dont use speedo for speed check anyway and if a larger radius increased the final drive then great - my project is to make the car a long range GT anyway....
Tyres I can work on but getting wheels right is a worry as they are a bespoke order and very pricey at £250ish a corner - so i really cannot get it wrong!
Jules didnt advise against the tyre width - he advised against touchng the wheels and tyres full stop!
I was happy to go with 245 r and 225 f but there is not a 225/40/17 tyre avaialable - not too bothered about roling radius dont use speedo for speed check anyway and if a larger radius increased the final drive then great - my project is to make the car a long range GT anyway....
Tyres I can work on but getting wheels right is a worry as they are a bespoke order and very pricey at £250ish a corner - so i really cannot get it wrong!
Stilly said:
Jules didnt advise against the tyre width - he advised against touchng the wheels and tyres full stop!
That sounded a tad strong. I'd hazard a guess that this only came out of what you defined as your requirements from the car. Joo is normally pretty keen....
BTW Having run on 18", I would certainly put the 16" set on for Euro Tours - so if its GT cruiser youre after - I would prob agree with him.
Dave
JR said:
jonathant said:
Stilly said:
not too bothered about roling radius dont use speedo for speed check anyway
Sorry to be boring, but are there any issues with potential MOT failures if the speedo reading is incorrect?
Yes!
But the MOT man/woman doesn't check the speedo reading when they carry out the MOT so how would they know ?? He/she doesn't check that the manafactures recommened tyre sizes are on the car either do they ??
simonb9 said:
But the MOT man/woman doesn't check the speedo reading when they carry out the MOT so how would they know ?? He/she doesn't check that the manafactures recommened tyre sizes are on the car either do they ??
The question was regarding potential issues which exist however I agree that it is unlikely to be picked up - even if you have a non-functioning speedo.
Hi Stilly, I did this 6 years ago - I have 215/40x17 on 8x17 ET 34 front and 255/35x18 rears on 8x18 ET 40 together with lowered suspension on Nitrons and it works... see my web site www.greenbear.org.uk - As you say no one makes a 225/40x17 and when I bought my tyres Bridgestone didn't make a 245 hence the 255's I will probabaly drop to a 245 at the rear and keep the 215 at the front but anyway there's no rubbing and I'm happy 
PM me if you want. Rich...
PM me if you want. Rich...JR said:
Stilly said:
For the avoidance of doubt - my speedo works perfectly
but it might not give a reading within the legal tolerence if you fit tyres of a different rolling radius.
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