FPerron Posted October 6, 2009 Share Posted October 6, 2009 I'm running 245/40/17 tires on 8" Rota Torque wheels.I use the car on road courses.I had to roll the rear fender lips and that worked fine, but now I notice that the inside tire walls (in the rear) are very slightly rubbing the lower control arms on hard cornering. I can cure this by either grinding a tiny bit off the control arms where the interference is happening (safe?), or I can install very thin (1/16") wheel spacers in the rear. Can anyone tell me if a "5 bolt circle spacer drilled for 11/16" studs" will fit our 5 x 100 hubs? Or, does anyone know where I can get a 1/16" spacer for Subaru? Thanks. BTW, Rao, I've already thought about turning the wing upside down to unload the suspension. Link to comment Share on other sites More sharing options...
GTTuner Posted October 6, 2009 Share Posted October 6, 2009 IMHO I do not recomend grinding off any material off of the control arm. What offset are your wheels? Link to comment Share on other sites More sharing options...
FPerron Posted October 6, 2009 Author Share Posted October 6, 2009 The wheels are stock replacement wheels designed for the Legacy - but that's irrelevant. The point is that I need the rears to be 1/16" further from the control arms. Any more than that, and they'll rub against the outer fender lips. So, I guess what I'm looking for are 1/16" spacers, but I only see them sold for American cars. Link to comment Share on other sites More sharing options...
rao Posted October 6, 2009 Share Posted October 6, 2009 Obviously the wing is the problem But you can get spacers that will fit the Legacy, the question is if you can find some that are thin enough. Rob IF YOU CARE ABOUT YOUR CAR YOU SHOULD NEVER DRIVE IT Link to comment Share on other sites More sharing options...
FPerron Posted October 6, 2009 Author Share Posted October 6, 2009 So, how does the 5 x 100 Subaru bolt pattern correspond to the typical American 5-bolt pattern? What does the "100" refer to? Link to comment Share on other sites More sharing options...
j0ebert Posted October 6, 2009 Share Posted October 6, 2009 It means 5 studs and 100mm spacing measured between the first and third studs. Find a local laser cutting house and they can probably make them for pretty cheap. Link to comment Share on other sites More sharing options...
FPerron Posted October 7, 2009 Author Share Posted October 7, 2009 Thank you. I think I knew that in a previouse life:redface: Link to comment Share on other sites More sharing options...
whitetiger Posted October 7, 2009 Share Posted October 7, 2009 whats your wheel offset? Link to comment Share on other sites More sharing options...
FPerron Posted October 7, 2009 Author Share Posted October 7, 2009 Are you suggesting I get a new set of wheels instead of spacers? Only kidding:lol: You probably want to know why I'm having interference problems with 245/40/17s on 8 inch rims when Xenonk says that will work:lol: Like I said, they're Rota Torques and are supposed to be for the Legacy. But, once again, offset is irrelevant in this case because there's not enough room in the back either inside or outside. I had to roll the fenders on the outside, and I'm rubbing on the inside. Of course, there's no problem unless I'm really flailing it on a road course - I mean hard! Link to comment Share on other sites More sharing options...
schwinn Posted October 7, 2009 Share Posted October 7, 2009 Since he's having so many issues giving the number everyone is asking: 8" Rota Torque wheels offset = 48mm (ref: http://www.fastwrx.com/rotatorque.html ) Stock subaru wheel offset = 55mm (ref: http://www.cars101.com/subaru/tiresandwheels.html ) As white tiger is implying, you need to fix your offset with spacers, as your Rotas are 7mm "too deep" on the hub. Link to comment Share on other sites More sharing options...
mustangendsley Posted October 7, 2009 Share Posted October 7, 2009 they work just fine on my 05 gt. I race on that set up and didn't have to roll my rear finder at all. What tires do you have? because my Dunlope star specs have a big cusion side wall. I also have stock suspension. Im not lowerd. Link to comment Share on other sites More sharing options...
FPerron Posted October 7, 2009 Author Share Posted October 7, 2009 Thanks for checking the Rota offset number - I was too lazy to do it given the fact that I can't do anything about it. My tires are BFG g-Force R1. BTW, if the wheels were stock offset, I would have had a much bigger problem with outer fender lip interference. Link to comment Share on other sites More sharing options...
pillboy Posted October 7, 2009 Share Posted October 7, 2009 Instead of grinding on the control arms, I think you should shave the tire sidewalls. It is still ugly. Link to comment Share on other sites More sharing options...
FPerron Posted October 7, 2009 Author Share Posted October 7, 2009 Yes, shaving the sidewalls sounds much safer:lol: I'll get right on it. Link to comment Share on other sites More sharing options...
Underdog Posted October 7, 2009 Share Posted October 7, 2009 Since he's having so many issues giving the number everyone is asking: 8" Rota Torque wheels offset = 48mm (ref: http://www.fastwrx.com/rotatorque.html ) Stock subaru wheel offset = 55mm (ref: http://www.cars101.com/subaru/tiresandwheels.html ) As white tiger is implying, you need to fix your offset with spacers, as your Rotas are 7mm "too deep" on the hub. It's the other way around... the 48mm offset sticks out further than the 55mm. Spacers will decrease the offset, not increase it. However, decreasing the offset will move the wheel lip away from the control arm. The Crimson Dynamo Link to comment Share on other sites More sharing options...
FPerron Posted October 7, 2009 Author Share Posted October 7, 2009 This really is rocket surgery, isn't it:lol: I'm still looking for 1/16" spacers. BTW, further research reveals that the "100" in 5 x 100 actually refers to the diameter (in mm) of the circle drawn through the centers of all the wheel studs. Link to comment Share on other sites More sharing options...
schwinn Posted October 7, 2009 Share Posted October 7, 2009 It's the other way around... the 48mm offset sticks out further than the 55mm. Spacers will decrease the offset, not increase it. However, decreasing the offset will move the wheel lip away from the control arm. Based on what I have read, I am correct. From http://www.gtsparkplugs.com/WheelOffsetCalc.html :Positive The hub mounting surface is toward the front or wheel side of the wheel. Positive offset wheels are generally found on front wheel drive cars and newer rear drive cars. Negative The hub mounting surface is toward the back or brake side of the wheels centerline.Since these numbers are positive-offset numbers, that means that the stock wheel is 55mm "toward the wheel side" of the centerline of the wheel. The Rotas are 48mm "towards the wheel side" which means that they are sitting "deeper" over the hub. (See the pictures for confirmation of this). Furthermore, online calculators such as this http://marksink.com/tire_wheel_offset/offset.html say that from the stock 7" wide, 55mm offset wheel, an 8"/48mm offset wheel: "The clearance from stut housing to the inside of the wheel will be 6mm LESS". The calculator on the previous link agrees with this as well. Therefore, a spacer will allow the Rota to sit further out (towards the wheel-side) and prevent rubbing on the control arm. EDIT: Some good information on wheel offsets and why they matter: http://www.hondatuningmagazine.com/tech/htup_0807_honda_wheel_offset_guide_faq_tips_biggest_lip_wheel/index.html And, yes, 5x100 = 5 bolt setup on a 100mm bolt circle. Link to comment Share on other sites More sharing options...
Underdog Posted October 7, 2009 Share Posted October 7, 2009 Therefore, a spacer will allow the Rota to sit further out (towards the wheel-side) and prevent rubbing on the control arm. This part is right. However, everything else there is misleading. The 55mm offset means that the mounting face of the wheel is 55mm from the centerline of the wheel. Given the same width wheel, a 48mm offset will pull the centerline of the wheel away from the center of the car, by 7mm. The reason an 8" e48 ends up close to the strut is because the extra half inch on either side of the wheel centerline. 1/2" = 12.7mm. ~13mm - 7mm (offset delta) = 6mm. The Crimson Dynamo Link to comment Share on other sites More sharing options...
FPerron Posted October 7, 2009 Author Share Posted October 7, 2009 No offense, but it shouldn't take an online calculator to figure out that if a tire is rubbing the control arm, a spacer will solve the problem. Link to comment Share on other sites More sharing options...
rao Posted October 7, 2009 Share Posted October 7, 2009 I suppose an offline calculator might work, but it would be risky. Rob IF YOU CARE ABOUT YOUR CAR YOU SHOULD NEVER DRIVE IT Link to comment Share on other sites More sharing options...
GTTuner Posted October 7, 2009 Share Posted October 7, 2009 Google custom wheel spacers. There is a guy out west that made me a set for a Charger. Made from billet aluminum. I'll see if I can find his number. He did a great job with a two day turn around. Link to comment Share on other sites More sharing options...
Guest Posted October 7, 2009 Share Posted October 7, 2009 Underdog is right. You need a lower offset wheels. Link to comment Share on other sites More sharing options...
FPerron Posted October 7, 2009 Author Share Posted October 7, 2009 Google custom wheel spacers. There is a guy out west that made me a set for a Charger. Made from billet aluminum. I'll see if I can find his number. He did a great job with a two day turn around. Thanks GTTuner. This is the kind of response I was hoping for. I get it that wheel placement within the fender well is affected by wheel offset:) Link to comment Share on other sites More sharing options...
Underdog Posted October 7, 2009 Share Posted October 7, 2009 Sorry FPerron, my response wasn't so much intended to help you (you don't need my help ), rather to correct schwinn. Good luck with the spacers! The Crimson Dynamo Link to comment Share on other sites More sharing options...
FPerron Posted October 7, 2009 Author Share Posted October 7, 2009 np Underdog. I do agree that it's important for people to understand the concept of offset and backspacing before they purchase wheels. I just think it's funny that a simple request for leads on wheel spacers elicits recommendations to the effect that I need wheels with a different offset - like I'm going to trash my wheels instead of looking for 1/16" spacers. Link to comment Share on other sites More sharing options...
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