Wheels and Tires for my 914-6 GT Project? |
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Wheels and Tires for my 914-6 GT Project? |
Tom1394racing |
Jan 27 2023, 07:34 AM
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#1
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Member Group: Members Posts: 275 Joined: 25-August 07 From: CT Member No.: 8,039 Region Association: North East States |
I would like to go with Minilites for the front and rear of my 914-6 GT project. I am considering the Mag style with 7X15 fronts and 8X15 rears. I would like to pair these with the Michelin TB15 tires. The sizes would be 18/60R15 (215/55-15) front and 23/62R15 (270/45-15) rears.
Anyone have experience with this combination on a GT clone? Will I require spacers on either the front or rear? |
ClayPerrine |
Jan 27 2023, 08:47 AM
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#2
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Life's been good to me so far..... Group: Admin Posts: 15,423 Joined: 11-September 03 From: Hurst, TX. Member No.: 1,143 Region Association: NineFourteenerVille |
I would like to go with Minilites for the front and rear of my 914-6 GT project. I am considering the Mag style with 7X15 fronts and 8X15 rears. I would like to pair these with the Michelin TB15 tires. The sizes would be 18/60R15 (215/55-15) front and 23/62R15 (270/45-15) rears. Anyone have experience with this combination on a GT clone? Will I require spacers on either the front or rear? 270/45-15 tires are going to be way too short for street use. Unless you change the ratios in the gearbox, you are going to be spinning the engine really fast on the highway. |
BillJ |
Jan 27 2023, 09:48 AM
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#3
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Senior Member Group: Members Posts: 1,093 Joined: 4-March 13 From: charlotte, NC Member No.: 15,610 Region Association: None |
The spacing is hard to say definitively. I have 8s and 9s on 15 inch rims (the 9s are minilties) and am okay but wont work for everyone. The 7s and 8s are normally just fine for flared cars and are quite common.
I only run track so not sure on your tire size choices. 45 seems like a really low profile to me for.street use.... |
Retroracer |
Jan 27 2023, 11:18 AM
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#4
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Senior Member Group: Members Posts: 609 Joined: 7-July 13 From: Bend OR Member No.: 16,100 Region Association: Pacific Northwest |
So on the question of spacers, part of the answer - fairly obviously - depends on the offset of the wheels you choose. In general, most wide body cars end up running large spacers on the front (25mm and wider) to both fill out the flares and and stop the tires rubbing on the inner fender.
On the rear, there are variables like 5-lug conversion that can make minor changes, but the need for spacers for 8x15 rims is either none or small (a few mm) for most Fuch rims (for example). Note the various "wider flare" options all look similar, but can vary dimensionally depending on the supplier and how they are fitted. And in terms of tire diameter / gearing, as a data point: I run 215/60R15 rear tires with a 914-4 901 transmission; this translates to around 73mph at 3000rpm on my car. FYI, hope this helps, - Tony |
Tom1394racing |
Jan 27 2023, 01:18 PM
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#5
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Member Group: Members Posts: 275 Joined: 25-August 07 From: CT Member No.: 8,039 Region Association: North East States |
I would like to go with Minilites for the front and rear of my 914-6 GT project. I am considering the Mag style with 7X15 fronts and 8X15 rears. I would like to pair these with the Michelin TB15 tires. The sizes would be 18/60R15 (215/55-15) front and 23/62R15 (270/45-15) rears. Anyone have experience with this combination on a GT clone? Will I require spacers on either the front or rear? 270/45-15 tires are going to be way too short for street use. Unless you change the ratios in the gearbox, you are going to be spinning the engine really fast on the highway. The car came with 185/65-15's. This gives a tire diameter of 24.47". The 270/45-15 tires are 24.57" in diameter. What am I missing? |
campbellcj |
Jan 27 2023, 06:28 PM
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#6
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I can't Re Member Group: Members Posts: 4,542 Joined: 26-December 02 From: Agoura, CA Member No.: 21 Region Association: Southern California |
I've currently got a set of the Michelin TB5s on 8x15 Fuchs, with spacers, and it's a great setup - however I have Tangerine Racing flares not GT...
The Hoosiers I've been using for track are actually about 23" diameter and it's never been a problem (for track) even though I have short gears as well. The car tops out around 135mph-ish which is not even achievable at some of the venues. |
mlindner |
Jan 28 2023, 06:38 AM
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#7
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Senior Member Group: Members Posts: 1,515 Joined: 11-November 11 From: Merrimac, WI Member No.: 13,770 Region Association: Upper MidWest |
I'm running 205-50-15 fronts and 225-50-15 rears on Maxilite. fronts only have 1/2 spacers. Works and looks great.
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Tom1394racing |
Jan 31 2023, 09:40 AM
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#8
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Member Group: Members Posts: 275 Joined: 25-August 07 From: CT Member No.: 8,039 Region Association: North East States |
Getting back to tire diameter...The stock 914 used 165/80-15 tires which had a diameter of 25.4" The Michelin TB's I am considering would have a diameter of 24.5. That would lead to a 3-4% error in Speedo reading. Doesn't seem like much to me.
Who looks at the speedo anyway? |
SirAndy |
Jan 31 2023, 11:39 AM
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#9
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Resident German Group: Admin Posts: 41,609 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
270/45-15 tires are going to be way too short for street use. Unless you change the ratios in the gearbox, you are going to be spinning the engine really fast on the highway. The car came with 185/65-15's. This gives a tire diameter of 24.47". The 270/45-15 tires are 24.57" in diameter. What am I missing? You are missing the part where Clay doesn't know that the 2nd number is a ratio, not an absolute. (IMG:style_emoticons/default/biggrin.gif) |
Steve |
Jan 31 2023, 12:30 PM
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#10
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914 Guru Group: Members Posts: 5,570 Joined: 14-June 03 From: Orange County, CA Member No.: 822 Region Association: Southern California |
Getting back to tire diameter...The stock 914 used 165/80-15 tires which had a diameter of 25.4" The Michelin TB's I am considering would have a diameter of 24.5. That would lead to a 3-4% error in Speedo reading. Doesn't seem like much to me. Who looks at the speedo anyway? It’s not just the speedo, but the shorter the tire, the higher the revs at a given speed, which can be annoying on the freeway and wasted gas. However 3-4% error will be negligible anyway for all the above. I’m also a fan of GPS speedometers. No bouncy speedo and always accurate. |
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