08-12-2016, 01:15 PM | #1 |
Drives: 2013 SS Camaro Join Date: May 2015
Location: San Diego, CA
Posts: 50
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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. |
08-12-2016, 04:11 PM | #2 | |
Drives: 2017 SS 1LE Join Date: Oct 2015
Location: San Ramon, Ca
Posts: 550
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08-12-2016, 04:54 PM | #3 |
Drives: 2013 SS Camaro Join Date: May 2015
Location: San Diego, CA
Posts: 50
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08-12-2016, 07:47 PM | #4 |
Drives: 2013 2SS (sold) Join Date: Jan 2016
Location: Seattle, WA
Posts: 602
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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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08-12-2016, 08:05 PM | #5 |
Drives: '14 1LE, Z28.R Join Date: Apr 2014
Location: PA
Posts: 308
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I'm running z28 wheels with 305/30-19 on my lowered 1LE with no issues...
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Far beyond stock....
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08-13-2016, 12:56 AM | #6 |
Drives: Camaro 1LE Join Date: Nov 2015
Location: Bay Area, CA
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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 |
08-13-2016, 03:00 AM | #7 |
Drives: 2013 2SS (sold) Join Date: Jan 2016
Location: Seattle, WA
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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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08-13-2016, 03:45 AM | #8 | |
Drives: Camaro 1LE Join Date: Nov 2015
Location: Bay Area, CA
Posts: 245
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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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08-13-2016, 09:02 AM | #9 | |
Drives: '14 1LE, Z28.R Join Date: Apr 2014
Location: PA
Posts: 308
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Quote:
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Far beyond stock....
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08-13-2016, 10:48 AM | #10 | |
Drives: Camaro 1LE Join Date: Nov 2015
Location: Bay Area, CA
Posts: 245
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Quote:
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. |
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08-14-2016, 05:44 PM | #11 |
Drives: '16 FiST Join Date: Apr 2012
Location: SEPA
Posts: 267
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Talking about CAM not STREET
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08-15-2016, 06:59 PM | #12 |
Drives: 2013 SS Camaro Join Date: May 2015
Location: San Diego, CA
Posts: 50
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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. |
08-15-2016, 07:07 PM | #13 |
Drives: Camaro Justice Join Date: Jun 2007
Location: Virginia
Posts: 20,174
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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 305s on these two... |
08-15-2016, 07:10 PM | #14 |
Drives: 2013 SS Camaro Join Date: May 2015
Location: San Diego, CA
Posts: 50
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