Why are 245/45/16 tyres so big?

106pete · Post by **106pete** » Thu Sep 19, 2013 6:29 pm

I've just fitted my 9j rear supra wheels and found the tyres are massive! Even tho technically they should be the same just wider....

This is my 16x8 wheel with 225/45/16 next to the 16x9 245/45/16 tyre

Not a great pic but overall the difference is around 20mm but why??

Post by **Donald** » Thu Sep 19, 2013 6:35 pm

Because the profile is a percentage of the width. Increase the width but keep the percentage the same = larger profile.

Post by **lewd lude lover** » Thu Sep 19, 2013 6:36 pm

yep. you would need to go down to something like a 245/40 16 to retain the same profile.

Post by **Donald** » Thu Sep 19, 2013 6:37 pm

You currently have 18mm difference

The closest you can get is 245/40 but then you will be 7mm smaller.

Post by **lewd lude lover** » Thu Sep 19, 2013 6:40 pm

and thus less manly...

Hmmmmmmm, difficult.

89 UKDM BA4 4WS (resto job!) · Post by **wurlycorner** » Thu Sep 19, 2013 6:45 pm

Indeed.
It's a ratio.

(Ask Donald about Ratio's - he's our expert on them it would seem, provided they're a 1:2 ratio (or is that 1.2 ratios?

)

106pete · Post by **106pete** » Thu Sep 19, 2013 6:57 pm

Ahhh I always thought it was a size not a percentage.

Nice one, thanks guys

Post by **NafemanNathan** » Thu Sep 19, 2013 7:34 pm

That is all

Doobie · Post by **Doobie** » Thu Sep 19, 2013 8:05 pm

At least this one wont go to 14 pages...

Post by **NafemanNathan** » Thu Sep 19, 2013 8:10 pm

Or will it?

@Donald