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MG MGB Technical - MGC wires on a MGB

Hi all, is there a down side to running 15" 72 spoke wire wheels on a BGT? I picked up this particular car a few weeks ago and it has 4 new 15" chromes wheel fitted plus a new 15" painted wheel as spare. All with Pirelli P6000 tyres so the PO has gone to a great deal of expense. The car looks great and drives okay but the increase in diameter must be making the car a bit long legged. I estimate the speedo is reading a bit low. The tyres are 185 x 65. Can anyone tell me the O/D difference between these and standard 14" wheels/tyres.

Maybe do a swop?

R Lawson

They are pretty much the same

165 14 185/65 15
Diameter 619.6mm 621.5mm
Circumference 1946.5mm 1952.5mm
Poke 25.5mm 25.5mm
Inset 101.5mm 101.5mm
Speedo error 0% -0.31%
Reading at 30mph 30mph 29.91mph
Reading at 60mph 60mph 59.82mph
Ride height gain 0mm 0.95mm
Arch gap loss 0mm 0.95mm
Chris at Octarine Services

I'm running the same WW on my '66 GT. The only draw-back that I have found is that to change a tyre on the rear, I have to jack the car up by placing the jack at the spring shackle to let the wheel down enough to get the wheel off. (Don't trust the jack-point) If not, I don't have the clearance between the tyre and the wing opening.
David Werblow

Use this simple calculator to figure out the difference
http://www.etyres.co.uk/tyre-size-calculator
Mike Howlett

I use this link (with calculator) for tyre and wheel sizes as it also explains more and connects to the other pages with other useful info - http://www.carbibles.com/tyre_bible_pg4.html
Nigel Atkins

I have to do that on my CB roadster with standard wire wheels, although I use the front spring hanger.
Paul Hunt

It is a good idea to change to 15" - it opens up more tire options.

Given that the MGB and MGC are identical in terms of fender room, there is no issue when fitting MGC wheels to an MGB.
Bill Spohn

This thread was discussed between 07/10/2013 and 25/10/2013

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