Bridgestone Potenza RE-71R 305/30R-19 (new size) Discussion Thread
Figured this would be more appropriate in its own thread.
I just burned through a set of 285/35R-19 RE-71Rs on my 19x10 front 19x11 rear MRR FS01 wheels. They lasted about 60 autocross runs. INCREDIBLE tire, instantly shaved 1.5 to 2 seconds off my regular times. Car runs CAM-C class. I'm definitely going to purchase another set. With the new sizes being released, I'm torn whether to run a square 305/30R-19 or a staggered 285/35R-19 front 305/30R-19 rear. I'd love to run a square 305/30R-19 however I'm worried about clearance on turn-in. These Bridgestones run very wide. I'm admittedly very under-prepared for CAM-C. Up front I'm running stock shocks with BMR 1.25" lowering springs and BMR sway bar. I have about -1.5 degrees camber dialed in up front, no toe. Can anyone with a similar setup chime in? I've heard a staggered setup isn't always ideal for autocross. |
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I have track wheels which are 19"x10.5" ET22 with OEM Z28 Trofeo R's on them, 305/30R19. They fit fine, although I haven't tracked them yet
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I'm running z28 wheels with 305/30-19 on my lowered 1LE with no issues...
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Oh, I posted this reply on that other thread. Here it is again:
I don't recommend messing with your balanced setup by introducing staggered tires. More grip in the rear = understeer. Then you'll have to spend a bunch of time and testing to tune out the understeer via tire pressures, sway bars, springs, shocks, offsets etc. 305/30/19 square will be fine. Try playing with a wheel and tire calculator if you are worried. Here is a known aggressive setup that works: 18x12 ET30 front and back + 30mm spacer in the front 335/30/18 Rival S tires Based on this pioneer (Cornercarver). He got to his specs by comparing backspacing with the Z/28 wheels. Backspacing specs that JPSS perfected before the Z/28 came out: http://www.camaro5.com/forums/showpo...7&postcount=20 http://www.camaro5.com/forums/showpo...&postcount=125 I'm going to run 305/30/19 on 19x10 ET16 in the front. This is how it compares: https://www.rimsntires.com/specspro....inite:%20Front I'm going to run 305/30/19 on 19x11 ET36 in the rear. This is how it compares: https://www.rimsntires.com/specspro....finite:%20Rear |
I'm not a big fan of running spacers on a track car, especially a 30mm one which is pretty thick.
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Sounds like fzss already has wheels. Whatever offset he chose for them, should be able to fit 305/30/19 tires safely. |
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Luckily the RE-71R has a super stiff sidewall. It'll handle being pinched on a wheel much better than most. A decent comp is what the guys in 2016 Camaros are doing. They are running 275/35/19 RE-71R on 19x8.5 front and 19x9.5 rear. |
Talking about CAM not STREET
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Thanks everyone for your personal insight.
I think I'm going to be the guinea pig and run a 305/30R-19 square. CAM class has no restrictions for wheels, however I already have a set so I'm just trying to work with what I have. The fronts (19x10) have a 23mm offset and the rears (19x11) have a 43mm offset. Going to probably order a couple 5mm spacers for the fronts just in case. |
Guinea Pig??? We have been running 305/30/19 RE-11s since 2009. We are running 325/30/19 RE-11s as well. I seriously doubt the 305/30/19 RE-71 will rub ;-)
325s http://static1.squarespace.com/stati...g?format=1000w http://static1.squarespace.com/stati...g?format=1000w 305s on these two... http://image.hotrod.com/f/31149877+w...ecleration.jpg |
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