OEM 20" GT4 Bridgestone RE-71R status
08-18-2016 | 12:15 PM
#46
Three Wheelin'
Joined: Oct 2003
Posts: 1,489
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^ GT3 uses the same front tire width as the GT4 but gets a wheel that's half an inch wider. You'd be upsizing the tire by 10mm on a narrower wheel. The RE-71R in that size doesn't show a rim width range, but PSS in the same size shows our 8.5" width as the minimum. That plus the increased sidewall thickness makes me want to wait. The half-inch or so increase in overall size also seems fairly significant to me given this car's already low ride height from the factory.
With a stiff sidewall, you do *not* want to pinch the tire with a marginal/too narrow wheel. I've seen tests where a narrower 71R on an ideal wheel stuck better than a wider 71R on the same wheel, within spec but at the far narrow end.
08-18-2016 | 11:51 PM
#47
Three Wheelin'
Joined: Jan 2012
Posts: 1,502
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From: TURN 1
I see Tirerack carries 255/40R20 and 285/35R20 for the RE-71Rs.
http://www.tirerack.com/tires/tires....re=835WR0RE71R
According to my calculations, the OEM tires have the following section heights (see http://www.tirerack.com/tires/tirete...jsp?techid=7):
front: 85.75mm
rear: 88.5mm
The tire sizes I indicated would have the following section heights:
front: 102mm
rear: 99.75mm
The difference between the OEM and the tires indicated is 0.44" in the front and 0.64" in the rear. This difference seems pretty minor to me.
Any thoughts?
http://www.tirerack.com/tires/tires....re=835WR0RE71R
According to my calculations, the OEM tires have the following section heights (see http://www.tirerack.com/tires/tirete...jsp?techid=7):
front: 85.75mm
rear: 88.5mm
The tire sizes I indicated would have the following section heights:
front: 102mm
rear: 99.75mm
The difference between the OEM and the tires indicated is 0.44" in the front and 0.64" in the rear. This difference seems pretty minor to me.
Any thoughts?
08-22-2016 | 03:08 PM
#49
Advanced
Joined: May 2016
Posts: 53
Likes: 6
I had too much trouble with 19's fitting, spacers and staying legal in SCCA autocross. So....
I just ordered 20" RE-71R's (285/35R20 & 255/40R20) from tirerack (Tanner). He said it would fit with no rubbing.
I'll report how they do...
I just ordered 20" RE-71R's (285/35R20 & 255/40R20) from tirerack (Tanner). He said it would fit with no rubbing.
I'll report how they do...
Last edited by Chris Hebert; 08-22-2016 at 03:09 PM. Reason: formatting
08-22-2016 | 10:48 PM
#50
Rennlist Member
Joined: Apr 2015
Posts: 270
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Originally Posted by usctrojanGT3
I'm going to be running 265/35/19 and 285/35/19 RE71Rs at Thunderhill in a few weeks. I'm wondering if I can run 305/30/19 on the rear. Hmmmm
08-23-2016 | 01:49 AM
#51
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Joined: Feb 2013
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Yes it does. In a pinch one weekend I had to use them at the track. They have worked well for me with no issues. The only time that I heard rubbing was driving on the freeway over some dips. A Porsche tech actually should me a Manuel which approved Porsche installing them.
08-23-2016 | 09:03 PM
#52
Intermediate
Joined: Aug 2016
Posts: 46
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From: San Franscisco Bay Area
Did you have them mounted yet? Is there any rubbing?
08-23-2016 | 09:33 PM
#53
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Joined: May 2016
Posts: 53
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Fingers crossed, but according to Tirerack they will 100% work..
Stay tuned...
08-25-2016 | 11:39 PM
#56
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Joined: May 2016
Posts: 53
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Bad news is tirerack guy made a mistake--> 20" RE-71R's (285/35R20 & 255/40R20) . The fronts will rub in the front fender. The rears may be ok, but i dont' want to take the risk.
So, the Good news is --> they are sending 20" RE-71R (295/30R20 & 245/35R20) . These are the exact size of the OEM, so I believe it has to work now!!
anyway, sorry for the mistake --- but should be good soon enough... either way i'll confirm the 20's when they arrive..
So, the Good news is --> they are sending 20" RE-71R (295/30R20 & 245/35R20) . These are the exact size of the OEM, so I believe it has to work now!!
anyway, sorry for the mistake --- but should be good soon enough... either way i'll confirm the 20's when they arrive..
Last edited by Chris Hebert; 08-26-2016 at 12:00 AM.
08-25-2016 | 11:56 PM
#57
Intermediate
Joined: Aug 2016
Posts: 46
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From: San Franscisco Bay Area
Are the 255s rubbing in the front?
The sizes he sent you are the only sizes available for RE-71R 20" wheels at this time: 255/40R20 and 285/35R20 (see the sizes at Tirerack).
The stock tires are 295/30R20 and 245/35R20, but they're not available for RE-71R. Are you saying Tirerack has these in stock now? They don't seem to appear on their web site yet.
The sizes he sent you are the only sizes available for RE-71R 20" wheels at this time: 255/40R20 and 285/35R20 (see the sizes at Tirerack).
The stock tires are 295/30R20 and 245/35R20, but they're not available for RE-71R. Are you saying Tirerack has these in stock now? They don't seem to appear on their web site yet.
08-26-2016 | 09:01 AM
#58
Thread Starter
Former Vendor
Joined: Mar 2006
Posts: 2,787
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From: South Bend, IN
Are the 255s rubbing in the front?
The sizes he sent you are the only sizes available for RE-71R 20" wheels at this time: 255/40R20 and 285/35R20 (see the sizes at Tirerack).
The stock tires are 295/30R20 and 245/35R20, but they're not available for RE-71R. Are you saying Tirerack has these in stock now? They don't seem to appear on their web site yet.
The sizes he sent you are the only sizes available for RE-71R 20" wheels at this time: 255/40R20 and 285/35R20 (see the sizes at Tirerack).
The stock tires are 295/30R20 and 245/35R20, but they're not available for RE-71R. Are you saying Tirerack has these in stock now? They don't seem to appear on their web site yet.
The 245's have come into stock. Anyone who has them pre-ordered with me should have allocation. The 295's are still inbound into the US, and we are likely to see them late September.
08-26-2016 | 11:35 AM
#60
Thread Starter
Former Vendor
Joined: Mar 2006
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From: South Bend, IN
Correct. Anyone who has both pairs on order with me has a pair lined up with their name on them until the rears come in - then I'll ship all four at once.