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Tire size

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Tire size
#1
Chanuteks Doug Pennington
Bogart, GA, USA   USA
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I have a 79 rubber bumper MGB that I plan to install a moss lowering kit. I want to install new wheels 6 x 14 with 20mm offset. Any suggestions for the best size tires for this setup?

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Re: Tire size
#2
Rayhpgh Avatar
Rayhpgh Ray Halackna
Pittsburgh, PA, USA   USA
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1974 MG MGB
2010 Ford Mustang
I would go with 15” wheels and then search for tires that keep the diameter approximately the same.

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Re: Tire size
#3
Granville58 David M
Blacksburg, USA   USA
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For 14" wheels, 175 70R 14 is, by far, the most popular choice. Some like to go up to 185, and some like 80R.

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Re: Tire size
#4
Sjmckean70 Avatar
Sjmckean70 Shayne Mckean
Suffolk, VA, USA   USA
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Without the lowering kit, 180/70R14 is a close to original fit. To be safe, with the lowering kit, maybe the 175s would be better? The circumference difference between the two is almost 1 1/2 inches, but the diaper is only 1/2 difference.


1977 MGB (White)
1977 MGB (Blue)

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Re: Tire size
#5
Arizona Shorty Avatar
Arizona Shorty Greg McC
Prescott, AZ, USA   USA
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1968 Jeep CJ-5
1975 Yamaha MC RD350
1977 MG MGB
1985 Jeep CJ-7
"the diaper" ??

OK. Backstory please.


GMc


Wait for me at the gate Tuffy, because without you they're never gonna let me in.

SDCH WTCH-X Twin Oaks Tuff Nutt
2008 - 2022

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Re: Tire size
#6
Sjmckean70 Avatar
Sjmckean70 Shayne Mckean
Suffolk, VA, USA   USA
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LOL! I meant diameter. : ). Stupid SIRI.


1977 MGB (White)
1977 MGB (Blue)

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Re: Tire size
#7
ingoldsb Avatar
ingoldsb Silver Member Terry Ingoldsby
Calgary, AB, Canada   CAN
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1971 MG MGB
If the car is lowered I think you'll find that 185 width is about the widest you can depend on without rubbing. I've got 6 inch wheels and I ended up using a Panhard Arm to ensure clearance. Rear axles on MGBs were often offset by 1/4" or more due to warpage on the rear springs (I suspect). Maybe if your axle is perfectly centered and your offset is ideal you could get away with 195 width.

185/65x14 is about 3% smaller than the original 155/82x14 tires on earlier cars. I believe that the RB cars used 185/70x14 (edit: upon reflection I think they used 175 width, not sure about the profile). 185/70x14 is about 2% larger than the 155/82x14 tires. Particular brands and models of tires also vary somewhat. Speedometers of that era were rarely more accurate than 3% anyway.

If I had it to do over again I'd go with 15" wheels - more selection of tires.


Terry Ingoldsby
terry.ingoldsby@DCExperts.com



Edited 1 time(s). Last edit at 2024-04-23 01:18 AM by ingoldsb.

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