Jun 21, 2006 #1 M mikeouk Active Member Joined May 12, 2005 Messages 332 Location cumbria Car 2010 bmw 325d m sport coupe.......2007 transit high roof ,LWB...... im currently using 235/40 18 ,there is a -1.24% differance in diameter if I use 225/40 18, being realistic does that matter at all?
im currently using 235/40 18 ,there is a -1.24% differance in diameter if I use 225/40 18, being realistic does that matter at all?
Jun 21, 2006 #2 Shude Hardcore MB Enthusiast Joined Jun 1, 2002 Messages 13,882 Location Cheshire Car CLK55 AMG mikeouk said: im currently using 235/40 18 ,there is a -1.24% differance in diameter if I use 225/40 18, being realistic does that matter at all? Click to expand... that works out as 4mm rolling radius difference, which if you think about it is less than worn tyres vs new tyres Should be no problem.
mikeouk said: im currently using 235/40 18 ,there is a -1.24% differance in diameter if I use 225/40 18, being realistic does that matter at all? Click to expand... that works out as 4mm rolling radius difference, which if you think about it is less than worn tyres vs new tyres Should be no problem.
Jun 21, 2006 #3 C Chris Murray Active Member Joined Mar 11, 2005 Messages 950 Are they for your R129? This should use 245/275
Jun 21, 2006 #4 Shude Hardcore MB Enthusiast Joined Jun 1, 2002 Messages 13,882 Location Cheshire Car CLK55 AMG Murray Systems said: Are they for your R129? This should use 245/275 Click to expand... Yeah good point, while it is possible to run tyres the same width as the wheels, even narrower (see DE modified cars ) you run a higher risk of kerb rash!
Murray Systems said: Are they for your R129? This should use 245/275 Click to expand... Yeah good point, while it is possible to run tyres the same width as the wheels, even narrower (see DE modified cars ) you run a higher risk of kerb rash!
Jun 21, 2006 #5 OP OP M mikeouk Active Member Joined May 12, 2005 Messages 332 Location cumbria Car 2010 bmw 325d m sport coupe.......2007 transit high roof ,LWB...... Murray Systems said: Are they for your R129? This should use 245/275 Click to expand... yeh its a r129, its currently got 265/35/18 rear and 235/40/18 front, so am I correct in saying the tyres are undersized already?
Murray Systems said: Are they for your R129? This should use 245/275 Click to expand... yeh its a r129, its currently got 265/35/18 rear and 235/40/18 front, so am I correct in saying the tyres are undersized already?
Jun 21, 2006 #6 stats007 MB Enthusiast Joined Aug 10, 2003 Messages 5,879 Location Hampshire Car 575M Not necessarily - they were sized like that for certain AMG wheels.
) you run a higher risk of kerb rash!
