Tire size question - Lightning Forum | LightningRodder.com
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post #1 of 9 (permalink) Old 09-19-2017, 02:57 PM Thread Starter
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Tire size question

I am getting a pair of Mickey Thompson ET street pro 315 60 15's and I was wondering if the bigger tire will help or hurt me at launch and my 60 foot time?
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post #2 of 9 (permalink) Old 09-19-2017, 03:34 PM
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Sir,
I hate the reply, "it depends", but that reply would be valid here. If the tire you are buying is taller that the tire you presently are using, in effect, it reduces your final ratio and most probably will affect your 60ft times. If you are having severe traction problems, the taller tire could help as it will provide a longer footprint and thus providing better traction. My point in all of this is you don't want to "over " tire your truck. You would be better served with a tire of same diameter. Hope this helps.

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post #3 of 9 (permalink) Old 09-20-2017, 05:09 AM
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If you're asking that question without providing a single detail on what your combo is, power level, expected e/t and 60' times, I suspect there will be a lot of other things under the learning curve that will affect your 60 more than just tire size lol, but yes it truly does depend.

9-10 second truck making 700-800 rwhp aiming for 1.3-1.4's in the 60? A 30" tire is what you need.

13 second truck making 400 rwhp aiming for sub 2.0's in the 60? A 30" tire is going to slow you down even more, you need a 26" or 28"

Lots of variables. Need at least a little detail to provide guidance.


M.HYDE: 2000 HD F-150 #0356 of 8197, Built 05/18/00, Bought 07/03/00, 820/875, _9.89@138.78
D.JEKL: 2000 HD F-150 #1552 of 8197, Built 06/20/00, Bought 06/25/09, 372/450, 13.59@100.95 (SOLD 10/15/11)
REPTAR: 2012 SVTF-150 #???? of ????, Built 01/19/12, Bought 08/26/11, ???/???, 15.24@_91.71
GEN.0L: 1985 XL F-150 w/'94 Lightning Donor Engine Swap, Holley Projection EFI, 03 HD Paint
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post #4 of 9 (permalink) Old 09-20-2017, 03:34 PM Thread Starter
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I'm sorry, I have a 2004 Lightning with a pulley, cold air intake and a tune. I decided to go with the 295 55 15 which is 27.75 inchs in diameter. The 315 60 15 is 29.9 inchs in diameter. I was stuck on getting the pro tire but they only had two options in 15 inch rims and my rims are 10 inchs wide, so my only option was the 315 60 15. I decided to go with the ET street SS which had a wider variety of tires.
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post #5 of 9 (permalink) Old 09-20-2017, 03:48 PM
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You can run 275 on 10" wheel just fine the normal accepted practice on rim size is 1" plus or minus of tread width we run them on 12" wheel on 275 class legal cars to keep them from growing so much down track
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post #6 of 9 (permalink) Old 09-21-2017, 05:02 AM
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you'll definitely be better off with the 295/55/15 over the taller 315/60/15 with just a basic bolt-on L.

I assume you've already got ground down calipers to clear the 15's?


M.HYDE: 2000 HD F-150 #0356 of 8197, Built 05/18/00, Bought 07/03/00, 820/875, _9.89@138.78
D.JEKL: 2000 HD F-150 #1552 of 8197, Built 06/20/00, Bought 06/25/09, 372/450, 13.59@100.95 (SOLD 10/15/11)
REPTAR: 2012 SVTF-150 #???? of ????, Built 01/19/12, Bought 08/26/11, ???/???, 15.24@_91.71
GEN.0L: 1985 XL F-150 w/'94 Lightning Donor Engine Swap, Holley Projection EFI, 03 HD Paint
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post #7 of 9 (permalink) Old 09-21-2017, 06:14 AM
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I really hope you those tires arent going on a 15x10 (dark/race star). The correct size in a 30" tire is this Mickey Thompson 3558: ET Street R Radial Tire P295/65R15 | JEGS

Just a Randy Smith and Tuned by norm Lightning....

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post #8 of 9 (permalink) Old 09-22-2017, 06:40 PM
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315's are perfectly fine on the dark stars. It's not as perfect as a 295 since the 295 actually has a tad larger contact patch, but they'll still work and usually easier to find and get deals on.


M.HYDE: 2000 HD F-150 #0356 of 8197, Built 05/18/00, Bought 07/03/00, 820/875, _9.89@138.78
D.JEKL: 2000 HD F-150 #1552 of 8197, Built 06/20/00, Bought 06/25/09, 372/450, 13.59@100.95 (SOLD 10/15/11)
REPTAR: 2012 SVTF-150 #???? of ????, Built 01/19/12, Bought 08/26/11, ???/???, 15.24@_91.71
GEN.0L: 1985 XL F-150 w/'94 Lightning Donor Engine Swap, Holley Projection EFI, 03 HD Paint
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post #9 of 9 (permalink) Old 09-22-2017, 07:25 PM
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Are the 315ís even available anymore besides the Pro version?
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