[nubbster927]

I finally installed a new set of wheels and tires I intend to use mostly for the track. Wheels are TR Motorsport C4 - 17x8 et40 in "light grey" at all four corners. No issues at all with brake caliper clearance with the 17 inch wheels. Weight is listed as 19.6 lbs on the tire rack website, but I didn't weigh them myself (for comparison, the 17x8 Volk TE37 weighs ~15.5 lbs but also costs ~6x as much unfortunately). Seems like this wheel is pretty popular among autocrossers, and from looking around on forums it looks like Tire Rack specifically made this wheel to cater to the racing/track day crowd.

Tires are 245/40/17 Bridgestone RE-71Rs at all four corners. No suspension modifications at all - car is a bone stock xDrive model. No rubbing whatsoever, no spacers required to make it fit. I was a little nervous going 245 all around since I wasn't sure how different the xDrive suspension is up front compare to the RWD models, but as far as I could find the clearance for wheels/tires is about the same.

I got to test the setup on some twisties near Denver, and the car felt transformed from the stock all-season run flats it had previously been riding on. Grip is amazing, and I'm really digging the smaller wheel/meaty tire look. Can't wait to use it on track. I'd totally recommend this to anyone looking for an easy, cost effective track wheel/tire combo.

Update: Can confirm that this combo is great for track use!

[john16443]

My wheel set up exactly on my M240i. I've run this setup at the track 3 times since December on Hankook R-S3's and am very pleased with them.

I will warn you right now, that if you run on the track, and really heat things up like you should, your center caps will come off. I lost 3 of 4 my first track day. The plastic tabs just melt and away they go. Since these are my track only wheels/tires, I didn't care. If you want to keep them, remove them before you run on the track.

[SteveInfante]

I'm wondering how much stretch I would get with a 215/45/17 tire on those. I just got new tires on the stock snowflakes (which are in deteriorating shape by the way) I would daily these. OP they look great on the white.

[syclonedriver]

I run the same wheels on my F23 with 245 R888s. I've used them at 3 or 4 autocrosses so far. They have a lot of grip but I still find myself over driving the car.
Last weekend I waited until late to change my wheels and I mistakenly left my 12&15 mm spacers on my car. I didn't realize that I forgot to remove them until I was in grid about to race. I decided to drive a little easy for the first two passes, I didn't see any sings of rubbing. Later in the day I may have had a little rubbing in the rear.
I just though some people would like to know that it is possible to run spacers with these wheels and the stock suspension.

[syclonedriver]

I swapped the wheels today and inspected for tire to fender contact. I found that I had contact at all 4 wheels. Maybe 8 or 10mm spacer would work. Some anti sway bars would probably help too. Also roll the front fenders.

Its was very cold the day of the race so the tires never got up to temperature. On a warmer day, with more grip, I would expect the body roll to increase and create more tire/fender contact.

[Cycle Pilot]

So, I have an M240i lowered with Dinan springs and I’m thinking about the 17 inch C4’s with Hankook RS4 245/40R17 to use for track days and autocross. Do you think I’d have any issues with rubbing?

[TakoMako]

Originally Posted by Cycle Pilot

So, I have an M240i lowered with Dinan springs and I'm thinking about the 17 inch C4's with Hankook RS4 245/40R17 to use for track days and autocross. Do you think I'd have any issues with rubbing?

Originally Posted by Cycle Pilot

So, I have an M240i lowered with Dinan springs and I'm thinking about the 17 inch C4's with Hankook RS4 245/40R17 to use for track days and autocross. Do you think I'd have any issues with rubbing?

I spoked to someone who uses the same setup, but with H&R springs.

[Cycle Pilot]

Originally Posted by TakoMako

I spoked to someone who uses the same setup, but with H&R springs.

Thanks!

[nubbster927]

Originally Posted by syclonedriver

I swapped the wheels today and inspected for tire to fender contact. I found that I had contact at all 4 wheels. Maybe 8 or 10mm spacer would work. Some anti sway bars would probably help too. Also roll the front fenders.

Its was very cold the day of the race so the tires never got up to temperature. On a warmer day, with more grip, I would expect the body roll to increase and create more tire/fender contact.

Weird, I inspected my tires after autocrossing and didn't see any signs of fender contact on any of the wheels. It was a warm day ~70F, and I drove right to the limit. I'm not running any spacers or rolled fenders or anything... Not sure how to explain the inconsistency.

[ChrisFulton]

Originally Posted by syclonedriver

I swapped the wheels today and inspected for tire to fender contact. I found that I had contact at all 4 wheels. Maybe 8 or 10mm spacer would work. Some anti sway bars would probably help too. Also roll the front fenders.

Its was very cold the day of the race so the tires never got up to temperature. On a warmer day, with more grip, I would expect the body roll to increase and create more tire/fender contact.

Originally Posted by nubbster927

Weird, I inspected my tires after autocrossing and didn't see any signs of fender contact on any of the wheels. It was a warm day ~70F, and I drove right to the limit. I'm not running any spacers or rolled fenders or anything... Not sure how to explain the inconsistency.

syclonedriver, did you mean that you had contact because you forgot to take your spacers off, and suggest either no spacers, or 10mm or less?

[jmwilson125]

Does anyone have a concern with the outside rolling diameter of 235/40r17 over stock? It's almost an 1" smaller than stock.

Would this only affect speedo? Or would it affect abs and other nannies as well?

[ChrisFulton]

Originally Posted by jmwilson125

Does anyone have a concern with the outside rolling diameter of 235/40r17 over stock? It's almost an 1" smaller than stock.

Would this only affect speedo? Or would it affect abs and other nannies as well?

Curious about this as well. Checking my speedo against GPS, I really couldn't tell that much of a difference. Any other concerns?
Car definitely sits lower though, as it was already low on Dinan springs.

[john16443]

Originally Posted by ChrisFulton

Curious about this as well. Checking my speedo against GPS, I really couldn't tell that much of a difference. Any other concerns?
Car definitely sits lower though, as it was already low on Dinan springs.

Use the tire and wheel calculator found in the E90 3 series Wheels and Tire forum. The differences between the 245/35/18 and 245/40/17 set up is inconsequential and won't affect ABS or any other nannies.

[nubbster927]

Originally Posted by jmwilson125

Does anyone have a concern with the outside rolling diameter of 235/40r17 over stock? It's almost an 1" smaller than stock.

Would this only affect speedo? Or would it affect abs and other nannies as well?

I remember when checking my speedo against GPS, the speedo read ~4-5 mph higher than the GPS at about 80 mph, whereas the stock tires read within 1-2 mph or so.

As far as ABS, I didn't notice a difference. Brakes still chattered like normal, I just stopped much quicker than before with all that new grip.

[jmwilson125]

Just ordered a square RS-4s 235/45r17 setup yesterday. I'm hoping these end up fitting without wheel spacers

[ChrisFulton]

Originally Posted by jmwilson125

Just ordered a square RS-4s 235/45r17 setup yesterday. I'm hoping these end up fitting without wheel spacers

Jim, don't know about the RS-4s, but ran 245/40/17 BS RE-71Rs at the track yesterday, no spacers, and had no issues and I am lowered on Dinan springs.

[syclonedriver]

Originally Posted by ChrisFulton

syclonedriver, did you mean that you had contact because you forgot to take your spacers off, and suggest either no spacers, or 10mm or less?

That's what I was trying to say. No spacers = no contact. I run spacers with the stock wheels to push them out a little. I forgot to take them off when I mounted my track wheels/tires.

I am finding that the cars that beat me at the autocross events almost always have wider wheels and tires. They are generally lighter as well.

[PLF69]

Originally Posted by jmwilson125

Just ordered a square RS-4s 235/45r17 setup yesterday. I'm hoping these end up fitting without wheel spacers

I'm supposed to receive the same wheels as the OP in black tomorrow they will be wearing RE-71R in 235/45-17.

From all my research everything should be fine.

[ChrisFulton]

Originally Posted by syclonedriver

That's what I was trying to say. No spacers = no contact. I run spacers with the stock wheels to push them out a little. I forgot to take them off when I mounted my track wheels/tires.

I am finding that the cars that beat me at the autocross events almost always have wider wheels and tires. They are generally lighter as well.

Thanks, that's what I assumed but wanted to be sure.
Yeah, I too am using spacers for the stock wheels. (12.5 all around.)
The new TR Motorsport C4s with 245/40/17 Bridgestone RE-71Rs (no spacers) worked well at the track!
Cheers.

[ChrisFulton]

Originally Posted by PLF69

I'm supposed to receive the same wheels as the OP in black tomorrow they will be wearing RE-71R in 235/45-17.

From all my research everything should be fine.

You should be fine as I have the same (but gray) with the RE-71R in 245/45/17 & I am lowered on Dinan springs. Track day with no issues.

[jmwilson125]

Originally Posted by PLF69

I'm supposed to receive the same wheels as the OP in black tomorrow they will be wearing RE-71R in 235/45-17.

From all my research everything should be fine.

I'm using my winter wheels which I think at 17"x8" et46. The methods for measuring et were questionable though.

I got them on today they seem to fit without rubbing, but I will have to do.some more testing.

[jmwilson125]

Originally Posted by ChrisFulton

You should be fine as I have the same (but gray) with the RE-71R in 245/45/17 & I am lowered on Dinan springs. Track day with no issues.

What is your offset?