Question for Non-Runflat tire users...
Thread Starter
Pro
Joined: Jan 2014
Posts: 585
Likes: 65
From: Sierra Nevada Foothills CA
Question for Non-Runflat tire users...
I am considering getting a set of light weight, forged wheels chiefly for the benefits of saving rotating weight. I think the common figure is that every single pound of weight off the wheel/tire assembly equals 4 lbs of weight removed from other places of a car. Thus, I am looking at a 40-50 lbs wheel/tire weight reduction which should have the effects of 160-200 lbs weight when it comes to acceleration and braking.
So, the question:
After switching to non-runflat tires (that also saves weight) what is the lightest list of tire repair kit you could find? I am interested in ideas/links to purchase:
1) Emergency scissor jack (hopefully aluminum)
2) Electric tire pump
3) Tire slime
4) General tire repair kit.
So, the question:
After switching to non-runflat tires (that also saves weight) what is the lightest list of tire repair kit you could find? I am interested in ideas/links to purchase:
1) Emergency scissor jack (hopefully aluminum)
2) Electric tire pump
3) Tire slime
4) General tire repair kit.
Thread Starter
Pro
Joined: Jan 2014
Posts: 585
Likes: 65
From: Sierra Nevada Foothills CA
Spare wheel, tire, and jack at home.
Otherwise use a smart phone map to find a nearby tire shop and drive to it. High performance tires have short stiff sidewalls anyway and driving on them at 30 MPH for ten minutes is not much problem. (well, I may be assuming 20 pounds of air in the tire.)
Or call a flatbed tow truck.
The biggest problem with custom wheels is breaking one on a pothole or curb and then there isn't a matched set or a quick replacement
.
Otherwise use a smart phone map to find a nearby tire shop and drive to it. High performance tires have short stiff sidewalls anyway and driving on them at 30 MPH for ten minutes is not much problem. (well, I may be assuming 20 pounds of air in the tire.)
Or call a flatbed tow truck.
The biggest problem with custom wheels is breaking one on a pothole or curb and then there isn't a matched set or a quick replacement
.
My twin turbo 3rd gen RX-7 (recently sold) came with a super light weight scissor jack. I wish I could find one for sale. Been looking all over for one.
Last edited by axr6; Apr 29, 2016 at 08:58 PM.
Thread Starter
Pro
Joined: Jan 2014
Posts: 585
Likes: 65
From: Sierra Nevada Foothills CA
Those are really nice wheels. Do you have the weight for them?
I would prefer the rear offset to be near the factory 79mm to make sure that there is no touching of the fenders. Do you have this setup? Is there any fender interference?
Team Owner
Joined: Sep 2014
Posts: 26,430
Likes: 493
I am considering getting a set of light weight, forged wheels chiefly for the benefits of saving rotating weight. I think the common figure is that every single pound of weight off the wheel/tire assembly equals 4 lbs of weight removed from other places of a car. Thus, I am looking at a 40-50 lbs wheel/tire weight reduction which should have the effects of 160-200 lbs weight when it comes to acceleration and braking.
So, the question:
After switching to non-runflat tires (that also saves weight) what is the lightest list of tire repair kit you could find? I am interested in ideas/links to purchase:
1) Emergency scissor jack (hopefully aluminum)
2) Electric tire pump
3) Tire slime
4) General tire repair kit.
So, the question:
After switching to non-runflat tires (that also saves weight) what is the lightest list of tire repair kit you could find? I am interested in ideas/links to purchase:
1) Emergency scissor jack (hopefully aluminum)
2) Electric tire pump
3) Tire slime
4) General tire repair kit.
Thread Starter
Pro
Joined: Jan 2014
Posts: 585
Likes: 65
From: Sierra Nevada Foothills CA
Hmmm.... with that figure a 40 lbs rotating assembly weight saving could translate to the equivalent of 800 lbs off the car... how could anyone resist such gains?
I got the 4:1 ratio numbers last week from the owner of the very popular CA racing shop that used to sponsor me during my SCCA racing years.
I got the 4:1 ratio numbers last week from the owner of the very popular CA racing shop that used to sponsor me during my SCCA racing years.
Last edited by axr6; Apr 30, 2016 at 01:30 PM.
Tech Contributor
Joined: Oct 1999
Posts: 41,036
Likes: 9,798
From: Charlotte, NC (formerly Endicott, NY)
Hmmm.... with that figure a 40 lbs rotating assembly weight saving could translate to the equivalent of 800 lbs off the car... how could anyone resist such gains?
I got the 4:1 ratio numbers last week from the owner of the very popular CA racing shop that used to sponsor me during my SCCA racing years.
I got the 4:1 ratio numbers last week from the owner of the very popular CA racing shop that used to sponsor me during my SCCA racing years.
Bill
Safety Car
Joined: Feb 2016
Posts: 4,424
Likes: 1,377
From: SC
I just carry 2 & 4 (plugging kit). Don't want or trust slime and the jack doesn't do you any good if you don't have a spare.
1) Emergency scissor jack (hopefully aluminum)
2) Electric tire pump
3) Tire slime
4) General tire repair kit.
1) Emergency scissor jack (hopefully aluminum)
2) Electric tire pump
3) Tire slime
4) General tire repair kit.
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Thread Starter
Pro
Joined: Jan 2014
Posts: 585
Likes: 65
From: Sierra Nevada Foothills CA
The only thing that concerns me regarding the above Pilot Sport tire exchange is that the listed tire diameters are slightly different. The non-runflat rear tire is listed on tirerack.com to be 0.2" larger. Minor difference, however, on hard compression my driver side rear tire already touches the rear wheel liner with the stock tire.
Interesting points to make regarding the jack. While I've never tried it, I would think it could be difficult trying to fix a flat tire with the weight of the car flattening it, possibly braking the bead also.
Last edited by Steve Garrett; May 3, 2016 at 12:56 PM. Reason: Merged Posts-please use the Multi-Quote button in the lower right hand corner (middle icon).
Team Owner
Joined: Sep 2014
Posts: 26,430
Likes: 493
Hmmm.... with that figure a 40 lbs rotating assembly weight saving could translate to the equivalent of 800 lbs off the car... how could anyone resist such gains?
I got the 4:1 ratio numbers last week from the owner of the very popular CA racing shop that used to sponsor me during my SCCA racing years.
I got the 4:1 ratio numbers last week from the owner of the very popular CA racing shop that used to sponsor me during my SCCA racing years.
Thread Starter
Pro
Joined: Jan 2014
Posts: 585
Likes: 65
From: Sierra Nevada Foothills CA
http://blog.caranddriver.com/tested-...-fiber-wheels/
Dazed Confused & Verklemp
Joined: May 2008
Posts: 1,397
Likes: 109
From: Naples, FL & Clear Lake, IA
On a Z51 Vette, same size non run-flat Michelin PSS will save you around 18 lbs total. Rotoforged wheels like TSW Interlagos or Cray (TSW) Spiders could save you an additional 12-16 lbs depending on size and weight.
Lighter wheels/tires really help handling and stopping distances, besides improving performance and gas mileage.
I cut over 70 lbs lf unsprung weight on my TT Flex by going with much lighter & smaller diameter wheels/tires. RPM's went up 8% but mileage didn't change due to the lower rolling resistance and weight loss. Know the PSS summer tires helped, but Flex handles like a sporty car. (Of course Megan Coilovers also help.)
Lighter wheels/tires really help handling and stopping distances, besides improving performance and gas mileage.
I cut over 70 lbs lf unsprung weight on my TT Flex by going with much lighter & smaller diameter wheels/tires. RPM's went up 8% but mileage didn't change due to the lower rolling resistance and weight loss. Know the PSS summer tires helped, but Flex handles like a sporty car. (Of course Megan Coilovers also help.)
Racer
Joined: Apr 2016
Posts: 478
Likes: 104
On a Z51 Vette, same size non run-flat Michelin PSS will save you around 18 lbs total. Rotoforged wheels like TSW Interlagos or Cray (TSW) Spiders could save you an additional 12-16 lbs depending on size and weight.
Lighter wheels/tires really help handling and stopping distances, besides improving performance and gas mileage.
I cut over 70 lbs lf unsprung weight on my TT Flex by going with much lighter & smaller diameter wheels/tires. RPM's went up 8% but mileage didn't change due to the lower rolling resistance and weight loss. Know the PSS summer tires helped, but Flex handles like a sporty car. (Of course Megan Coilovers also help.)
Lighter wheels/tires really help handling and stopping distances, besides improving performance and gas mileage.
I cut over 70 lbs lf unsprung weight on my TT Flex by going with much lighter & smaller diameter wheels/tires. RPM's went up 8% but mileage didn't change due to the lower rolling resistance and weight loss. Know the PSS summer tires helped, but Flex handles like a sporty car. (Of course Megan Coilovers also help.)
Burning Brakes
Joined: Aug 2009
Posts: 770
Likes: 164
From: Southeastern NM
IMO, I would go to lighter aftermarket wheels for sure!!!!
