will these fit
- Thread starter ashley
- Start date
Paul Fraser
New member
...if you are replacing say, 8Js with 8Js. but if you are replacing 8js with 9Js you probably won't need spacers at all.
See http://www.1010tires.com/WheelOffsetCalculator.asp and try the wheels alone before you shell out any cash.
See http://www.1010tires.com/WheelOffsetCalculator.asp and try the wheels alone before you shell out any cash.
ashley
New member
Ok guys just done some more digging on the wheels and by the valve stem are the numbers 7 55 front and 9 70 rear I'm assuming these are the rim width and offset respectively.
According to the handbook the existing wheels are 7J 55mm offset front so should be a direct replacement and on the rear 8J 52.3mm offset
Using the offset calculator in Paul's post it says, ' inner clearance 31mm less' and 'outer position retract by 5mm' What does this indicate for spacer sizes I had thought the spacer was the difference between the original offset and the new i.e. 52.3 and 70 therefore 17.7 which is what Diver suggested
According to the handbook the existing wheels are 7J 55mm offset front so should be a direct replacement and on the rear 8J 52.3mm offset
Using the offset calculator in Paul's post it says, ' inner clearance 31mm less' and 'outer position retract by 5mm' What does this indicate for spacer sizes I had thought the spacer was the difference between the original offset and the new i.e. 52.3 and 70 therefore 17.7 which is what Diver suggested
Paul Fraser
New member
Yes, the spacer just 'centres' the wheel again, but as it is an inch wider (9J rather than 8J) you have half an inch (13mm) less space either side. If you don't use a spacer to recentre the wheel all the extra width is at the back as the offset difference moves the wheel further into the wheelarch.
Practically, I think it will bolt on and you won't notice any difference. An inch less clearance round the back won't be critical, well not in a 944 anyway.
BTW, I assume you are running Design 90s at the moment?
Practically, I think it will bolt on and you won't notice any difference. An inch less clearance round the back won't be critical, well not in a 944 anyway.
BTW, I assume you are running Design 90s at the moment?
ashley
New member
yeah that's right Paul, the D90s need refurbing and although the purists won't like it I can't get away with them, too much metal in the middle if you know what I mean,
I've done a swap deal with a company who were at the R3 Raby Castle show at the weekend ideally would have liked 17" but the ones I getting are original and in very good condition with good Continental tyres all round.
just concerned about needing spacers as I'll be driving the car down to them to do the swap and didn't want to find they wouldn't go on. If you guys seem to think they'll be ok I can always add the spacers later if aesthetics demand.
I've done a swap deal with a company who were at the R3 Raby Castle show at the weekend ideally would have liked 17" but the ones I getting are original and in very good condition with good Continental tyres all round.
just concerned about needing spacers as I'll be driving the car down to them to do the swap and didn't want to find they wouldn't go on. If you guys seem to think they'll be ok I can always add the spacers later if aesthetics demand.
The fronts as you say are the same, so no issue.
If the std rears are 8J ET52.3mm, then for a set of 9J wheels to have the outer edge sitting in the same position in the arch you would need to add half an inch to the offset, and so they would need to be 9J ET65. This is usually only an issue if you have limited clearance between outer arch and wheel on current wheels so want to keep the outside edge in same place. The ones you mention are 9J ET70, so they will be pushed inwards (towards the shock/chassis) by 5mm, plus the extra inch that the wheels are wider, so 30.4mm. A 5mm spacer will get you back to look of the original wheels (i..e outer lip in same place as before), Obviously a ~17mm spacer will get you back to original centreline, but then you need to account for half an inch extra clearance either side on the original..
The only other thing to consider is whether the inner design of the wheel may foul the caliper? Again, I'd doubt this would be a problem as you aren't far out, just things to consider. HTH.
If the std rears are 8J ET52.3mm, then for a set of 9J wheels to have the outer edge sitting in the same position in the arch you would need to add half an inch to the offset, and so they would need to be 9J ET65. This is usually only an issue if you have limited clearance between outer arch and wheel on current wheels so want to keep the outside edge in same place. The ones you mention are 9J ET70, so they will be pushed inwards (towards the shock/chassis) by 5mm, plus the extra inch that the wheels are wider, so 30.4mm. A 5mm spacer will get you back to look of the original wheels (i..e outer lip in same place as before), Obviously a ~17mm spacer will get you back to original centreline, but then you need to account for half an inch extra clearance either side on the original..
The only other thing to consider is whether the inner design of the wheel may foul the caliper? Again, I'd doubt this would be a problem as you aren't far out, just things to consider. HTH.
Paul Fraser
New member
Hallsy, sorry, but the figures you give are just plain wrong.
Ashley, you can have a look behind the wheel if you can get underneath the back fo the car and see if you have the appropriate clearance. Do you have a small ramp you can put it on? Alternatively, what size of wheels are on the C4S? Are they 11J/40mm on the back? If so they will be 25mm further in at the back (and a ridiculous 50mm out at the front) which would give you a very good idea of the likely clearance at the back, especially if, again, you can have a look.
Ashley, you can have a look behind the wheel if you can get underneath the back fo the car and see if you have the appropriate clearance. Do you have a small ramp you can put it on? Alternatively, what size of wheels are on the C4S? Are they 11J/40mm on the back? If so they will be 25mm further in at the back (and a ridiculous 50mm out at the front) which would give you a very good idea of the likely clearance at the back, especially if, again, you can have a look.
Sorry Paul, I had a moment of madness and edited it, but then was thinking about it earlier and realised I was right the first time!! I've edited it again. If it still makes no sense then I'll delete it all together, I'm still half asleep so could still be talking rubbish!!!
Ashely, excuse my rambling, I was confusing myself!!!
Ashely, excuse my rambling, I was confusing myself!!!
Paul Fraser
New member
I think you have it correct now.
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