Wild Bill

Hi All,
I am still in quest of max sized wheels and tires for my Shark on the cheaps. I know this is a contradiction of terms, but his week I purchased some 17" K20 Kinesis off of ebay, 9" front offset 64mm and 11" rear offset 52mm. Got 'em for a great price and felt the offsets would be just about right... WRONG! I test mounted a Yoko 255/40/17 to check the front fitment and the thing seems to me to stick out a mile. It did not rub during a few laps through the neighborhood, but in extreme parking manuever type turns it rubs the inside edge of the rocker moulding at the rear and almost touches the liner in the front too. Maybe I am not understanding offset measurement, but it's not a terribly complicated calculation. How can 1mm less than ideal make that much difference?

Here is a pic of the front. How much does it cost to have these reworked to a higher offset? And is Kinesis the only place that can handle this for me? Also, can you disassemble/re-assemble these for DIY refinishing?



Thanks,
Bill

Wild Bill

Another view...

Shane

Bill those are real nice wheels and I can see why your tormented. I would have thought with those offsets they would fit. That is the front wheel right? The tyre be on backwards though!

jserio

With that tire in reverse you will Hydro way more then you will fancy I am pretty sure.

jserio

Never mind Bill. I see that is the pass side tire. BTW are there any factory spacers on the fronts. Just shooting from the hip.

onebad928s

if you think the fronts are bad wait until you try the rears.i have a 53mm backspacing on the rear with a 9.5" inch rim and i had to go to a negative camber so they would just miss the lip.

Good Luck
Lou
83 928 5speed

Lagavulin

Are you sure the front offsets are 64mm?

Your new 9.0 x 64mm should protrude an addtional 1.04" outwards towards the fender versus the stock S4 rim.

For comparison, my 9.5 x 68mm protrudes an addtional 1.13" outwards towards the fender versus the stock S4 rims.

However, mine do not hang out from the fender as much as yours, and is the reason why I wonder whether your fronts actually have 64mm offsets.

Here the best pic I have to show how my fronts look:

GlenL

Lags math is right. (And what I was going to say) Looks like you've gained more than an inch outwards.

Might not be your problem, but some wheels are speced with "backspacing" and some with "offset." Backspacing is the distance between the inside of the rim and the hub face while offset is the distance from the middle to the hub face.

Here's a check: If you measure from the back of the wheel to the hub face it should be about 183mm for 64mm offset. This allows 5mm for the lip.

kjcracer

I also have doubts about the 64 mm offset being the real number. As you shared....that being said, IF you're stuck, your next (and the real question) is more along the lines of "how do I fix this?" If you install a one half inch wider "inner" rim half matters will improve. Even though the bead will stay where it is on the outside...the tread area will shift over by 1/4 of an inch (farther inside.) You will then have a 9.5 " wide wheel that has 6 mm more offset than before. (Whatever that is.) I'd contact Kinesis, of course. Good luck. Kim

Wild Bill

Thanks for the replies... I keep doing the math and it just doesn't add up!

These are the numbers:
Wheel width = 10" overall and 9" inside bead to bead

Backspace measured from mounting flange up to straight edge across back of wheel = 7" or 177.8mm

9" = 228.6mm/2 = 114.3mm mid line
177.8mm less 114.3 = 63.5mm offset

What am I doing wrong? Perhaps this is really a 9.5 inch rim?

9.5" = 241.3/2 = 120.65mm mid line
177.8mm less 120.65 = 57mm offset

Perhaps in my desire for these wheels to work out as is, skewed my perspective in taking measurements.

Kinda like when I went down to Discount Tire and got the 255 mounted up... eventhough I knew when I mounted the bare rim that it stuck out way too far... And yes I know the directional tread faces the wrong way. Drivers side is just easier to get to in the garage.

Unless changing offsets is cost effective... Which I'm thinking it is not. I will probably just sell these and keep on looking.

Anybody have any experience in reworking Kinesis?

Thanks,
Bill

Joe Dyer

Call Tom at Kinesis and discuss. It's best to let Kinesis do any work to the rims.

Joel928s4

Hi Bill, sorry to hear about your wheels not fitting correctly. I have some Ronals that I really like on my car but they are spaced for a 964 so I'm thinking about having the front set "shaved" a bit if it is possible. Please keep us updated on your situation. Other than that your car is beautiful! Thanks, Joel

Wild Bill

Thanks Joel... I have read others discussions of "shaving" or otherwise removing material from the hub flange to gain a few mm. Mainly those folks attempting to get better fit out of front one piece factory wheels. Someone stated that 3mm was the most that you could go. I contacted several wheel repair places and none of them indicated that this was something they would do or even recommend. On my Kinesis the mounting flange is quite thick, but I have too, too far to go to even consider this.

I will contact Kinesis on Monday, but I am not too optimistic that this will be an economical solution. Makes no sense to spend more $ on reworking and refinishing these than I it costs to buy a new set. Really determined to find wheels that can run something larger than 225s up front.

I will let you know what I find out from Kinesis...

Anyone care to make me an offer for these wheels? They are great if you are going for that special low-rider skateboard look on your 928!

Garth S

Wild Bill,
The ET of those beautiful wheels is 50mm!
I could tell you about the complex calculus used to arrive at this - but to listen to it would even make me wild!
The simple (and truthful) version is that as you measured 'backspace' from the mounting flange to the back face of the wheel (and not to the inner face of the back bead), then the reference center is determined from the total physical width of the wheel: This is 10", not 9".
So, ET =10"/2-7"=2"=50mm! "n'est ce pas?"

James-man

Sound like a good idea to sell your new fronts to someone who will find the width suitable for rears. They would fit on the rear just fine, wouldn't they?

Have you tried this wheel/tire on the rear yet - just to see?