RUF Wheels - Tire Choice - 17x10 & 17x9 - NANKANG CRS??

[mikedsilva]

I need new tires. My current Toyo are over a decade old.. OK for running on the street (car has barely been driven the last decade) but spirited driving not a good idea.

Rims are Speedline for RUF - F 17x9 ET -17.7
R 17x10 ET +5
Car is a widebodied SC so it's running a 28mm spacer on the rear.

Current tire size is 245 40 17 and 275 40 17.

Struggling to find matching front and rear tires here in Aus. I have come across Nankang CRS which make a 245 40 and a 275 35. the 275/35 would actually get me closer to stock circumference.

Seeing as most of my driving is on the street, not sure this would be too aggressive an option?

How about running narrower tyres.. 225/45 and 255/50? are these too narrow for the 9s and 10s? It would give me a lot more options.

Open to suggestions..
Mike

here is how the car sits now on the current rims and tires.

[Cory M]

The CRS is a really a competition tire with a 200 treadwear rating. Falken RT660 is similar and comes in same sizes. I've used them on the race track and they have great performance but don't expect much longevity.

[mikedsilva]

Originally Posted by Cory M

The CRS is a really a competition tire with a 200 treadwear rating. Falken RT660 is similar and comes in same sizes. I've used them on the race track and they have great performance but don't expect much longevity.

Fair point. This car doesnt get used much. So if they last a couple years I think that would be acceptable? How many street miles could one expect?

[mikedsilva]

Originally Posted by Cory M

The CRS is a really a competition tire with a 200 treadwear rating. Falken RT660 is similar and comes in same sizes. I've used them on the race track and they have great performance but don't expect much longevity.

But I'm open to suggestions to using different but complementing brands, from front to rear.

[Noah930]

Are Nitto NT05 available for you? I have the 235/275 sizing on my turbo (with 9s and 11s).

[mikedsilva]

Originally Posted by Noah930

Are Nitto NT05 available for you? I have the 235/275 sizing on my turbo (with 9s and 11s).

Is that 235/40 and 275/40? If so, yes the NT05 is available here... not cheap mind.
What are they like on the road?

[Bill Verburg]

Originally Posted by mikedsilva

I need new tires. My current Toyo are over a decade old.. OK for running on the street (car has barely been driven the last decade) but spirited driving not a good idea.

Rims are Speedline for RUF - F 17x9 ET -17.7
R 17x10 ET +5
Car is a widebodied SC so it's running a 28mm spacer on the rear.

Current tire size is 245 40 17 and 275 40 17.

Struggling to find matching front and rear tires here in Aus. I have come across Nankang CRS which make a 245 40 and a 275 35. the 275/35 would actually get me closer to stock circumference.

Seeing as most of my driving is on the street, not sure this would be too aggressive an option?

How about running narrower tyres.. 225/45 and 255/50? are these too narrow for the 9s and 10s? It would give me a lot more options.

Open to suggestions..
Mike

here is how the car sits now on the current rims and tires.

I know nothing about Nankang tires but the sizes 245/40 & 275/35 are perfect for those wheels, You will notice a considerable jump in the cars lively ness compared to 245/45 & 275/40

[Bill Verburg]

Originally Posted by mikedsilva

I need new tires. My current Toyo are over a decade old.. OK for running on the street (car has barely been driven the last decade) but spirited driving not a good idea.

Rims are Speedline for RUF - F 17x9 ET -17.7
R 17x10 ET +5
Car is a widebodied SC so it's running a 28mm spacer on the rear.

Current tire size is 245 40 17 and 275 40 17.

Struggling to find matching front and rear tires here in Aus. I have come across Nankang CRS which make a 245 40 and a 275 35. the 275/35 would actually get me closer to stock circumference.

Seeing as most of my driving is on the street, not sure this would be too aggressive an option?

How about running narrower tyres.. 225/45 and 255/50? are these too narrow for the 9s and 10s? It would give me a lot more options.

Open to suggestions..
Mike

here is how the car sits now on the current rims and tires.

I know nothing about Nankang tires but the sizes 245/40 & 275/35 are perfect for those wheels, You will notice a considerable jump in the cars lively ness compared to 245/45 & 275/40

[spuggy]

Originally Posted by mikedsilva

How about running narrower tyres.. 225/45 and 255/50? are these too narrow for the 9s and 10s? It would give me a lot more options.

I run Falken Azenis RT615K+ (another 200 wear rating tire) in 225/45/17 and 255/40/17 on my Ruf 8s & 9s with SC flares. They drive nicely, seem acceptable comfortable and quiet for street use, while very grippy & predictable. With big brakes and 420HP at the rollers, I don't have traction issues at either end. Like 'em just fine and will probably buy another set when they wear out.

The rear size would be in spec (8.5-10"J), but the front would be a bit stretched (7-8.5J is the spec). But that's not extreme at all.

245/45/17 & 275/40/17 would seem to be a better match for 9s & 10s in a widebody, but for an N/A car you seem a tad over-tired and should maybe be careful with profile/section etc to reduce the torque loss and rolling resistance. Especially as Rufs aren't light wheels.

IME, most extreme hi-perf summer tires don't wear out so much as age/get hard; coming up on the end of the 3rd fall season, may still have legal tread - but will push, tramline and squirm around on wet roads round 40F where they didn't the year before... So hey-ho for the wheels shod with WinterContacts, and a new set of summer rubber in the Spring.

If you don't have seasons or only ran them in warmer temps, they would probably be just fine until they wore out.

[Bill Verburg]

here's a comparison of fit an toque costs
225/45 & 255/40 vs 245/45 & 275/40 on you existing wheels(btw ET for the fronts is +17.7), the 225/255 cobo gains you ~ 16.1 lb/ft and should be plenty of tire for up to ` 330 HP


245/45 & 27540 vs 245/40 & 275/35, there the /40 & /35 gains ~22.3 Hp over the /45 & /40


The Sumis were randomly chosen because they have the pertinent sizes, other tires in those sizes will be give similar results as a small difference in wt only imparts a small difference in torque cost., By far the distance of the weight from the axis is the more critical factor

[mikedsilva]

Originally Posted by spuggy

I run Falken Azenis RT615K+ (another 200 wear rating tire) in 225/45/17 and 255/40/17 on my Ruf 8s & 9s with SC flares. They drive nicely, seem acceptable comfortable and quiet for street use, while very grippy & predictable. With big brakes and 420HP at the rollers, I don't have traction issues at either end. Like 'em just fine and will probably buy another set when they wear out.

The rear size would be in spec (8.5-10"J), but the front would be a bit stretched (7-8.5J is the spec). But that's not extreme at all.

245/45/17 & 275/40/17 would seem to be a better match for 9s & 10s in a widebody, but for an N/A car you seem a tad over-tired and should maybe be careful with profile/section etc to reduce the torque loss and rolling resistance. Especially as Rufs aren't light wheels.

IME, most extreme hi-perf summer tires don't wear out so much as age/get hard; coming up on the end of the 3rd fall season, may still have legal tread - but will push, tramline and squirm around on wet roads round 40F where they didn't the year before... So hey-ho for the wheels shod with WinterContacts, and a new set of summer rubber in the Spring.

If you don't have seasons or only ran them in warmer temps, they would probably be just fine until they wore out.

Yep, where I live, we are warm(ish) most of the year. Car is currently only n/a but soon to be turboed... Trying to get my head around different tyres and how they sit on a rim. I've seen some 255/40 on a 10inch rim and they look ok... but then other 255/40 look way stretched on a 10inch rim (the lip of the rim sticking out!)

Trying to find pics of the actual RUF 10inch rims with a 255 section tyre.
Whilst the 245/40 and 275/35 sizes might be good for the 9in and 10in rims, I will get access to other brands if I can run the 225 and 255 sections ...

[mikedsilva]

Originally Posted by Bill Verburg

here's a comparison of fit an toque costs
225/45 & 255/40 vs 245/45 & 275/40 on you existing wheels(btw ET for the fronts is +17.7), the 225/255 cobo gains you ~ 16.1 lb/ft and should be plenty of tire for up to ` 330 HP

hi Bill
for some reason I thought my front offset was -17.7 (as opposed to +)

Thanks for the table. I have not seen this before so still trying to decipher!

But I am leaning toward the 225 and 255

[mikedsilva]

Originally Posted by Bill Verburg

here's a comparison of fit an toque costs
225/45 & 255/40 vs 245/45 & 275/40 on you existing wheels(btw ET for the fronts is +17.7), the 225/255 cobo gains you ~ 16.1 lb/ft and should be plenty of tire for up to ` 330 HP


245/45 & 27540 vs 245/40 & 275/35, there the /40 & /35 gains ~22.3 Hp over the /45 & /40


The Sumis were randomly chosen because they have the pertinent sizes, other tires in those sizes will be give similar results as a small difference in wt only imparts a small difference in torque cost., By far the distance of the weight from the axis is the more critical factor

Bill, can you run the numbers to compare (225/45/17 : 255/40/17) to the (245/40/17 : 275/35/17) please?

[Noah930]

Originally Posted by mikedsilva

Is that 235/40 and 275/40? If so, yes the NT05 is available here... not cheap mind.
What are they like on the road?

Sorry for not responding sooner.

Yes, 235/40 and 275/40. I have them on 17x9 and 17x11 wheels, but they will obviously fit on your wheels, too. I like them a lot. They are very grippy and progressive, so they are great street tires for canyon carving. With a treadwear rating of something like 200, they last me a few years (maybe 3000-4000 miles/year?). I would buy them again.

[Bill Verburg]

Originally Posted by mikedsilva

Bill, can you run the numbers to compare (225/45/17 : 255/40/17) to the (245/40/17 : 275/35/17) please?

275 is ~+6lb-ft

[mikedsilva]

Just an update.

I ended up with the Nankand CRS in 245 40 17 F and 275/35/17 Rear. Fit is excellent; they look just "right" on the rims.

Drove on the street or a couple weeks. First impressions.. they feel quite vague compared to the Yoko AD09 I had been borrowing from a friend, while my wheels were off being refurbished. When cold, the rear will step out VERY easily even with my n/a motor.
When driving in the hills, temp is obviously up by then and grip feels fine. But again, not quite as planted as the AD09 felt the week before.

Had first track day with them. They felt fantastic compared to the old Toyos I ran last time! I never felt like grip was an issue and could even push the car to the point of gentle understeer through some of the turns. (I'm an amateur so that was a new experience for me). It was a mainly right turn track, so the left tyres were loaded up a bit.

[mikedsilva]

update -
My rears are starting to get close to the treadwear indicator.. The fronts have heaps of tread left, but they are starting to "tramline' a lot ... chasing all the camber changes on our ****ty roads.

So i'm thinking a change is on the cards again. it's been 2 years so about time...

Trying to talk myself into going for a 255/40/17 rear... maybe a michelin ps4?

Would love to see a picture of a 255 tyre on a 10inch ruf wheel...

[Bill Verburg]

Originally Posted by mikedsilva

update -
My rears are starting to get close to the treadwear indicator.. The fronts have heaps of tread left, but they are starting to "tramline' a lot ... chasing all the camber changes on our ****ty roads.

So i'm thinking a change is on the cards again. it's been 2 years so about time...

Trying to talk myself into going for a 255/40/17 rear... maybe a michelin ps4?

Would love to see a picture of a 255 tyre on a 10inch ruf wheel...

These are 255/40x17 on 9.5 and 225/40x17 on 8