Will a 6% increase in rolling circumference make a huge diff

Adam_NAclubman · Postby **Adam_NAclubman** » Wed Jul 19, 2006 12:33 pm

I forgot I was going from 14 inch to 15 inch :lol:

185/60/14 to 195/60/14 would see an increase in diameter of 12mm, so yeah, it would be about an inch and a half going to 195/60/15, though maybe a tad less depending on whether a 195 stretches much to get onto a 7 inch rim.

Maybe I'll wait an extra couple of weeks and get a full set of 195/50/15's instead

Adam_NAclubman · Postby **Adam_NAclubman** » Tue Aug 22, 2006 8:49 pm

Went with 195/50/15 A539's. Should be a 3% decrease in rolling circumfrence but I can live with that

http://s47.photobucket.com/albums/f152/ ... an/MX5/P1/

Ended up that the rh rear was scrubbing on bumps and lh corners in the hills so we rolled the guard with a footlong piece of a tree branch on the side of the road :lol:

Barely scrubbed after, only on BIG bumps, and the guard was rolled really smoothly with no damage to any of the paint. Pity we redid it with a metal pipe after we got back home

JBT · Postby **JBT** » Tue Aug 22, 2006 9:20 pm

195/50/15\" is the correct size.

Adam_NAclubman · Postby **Adam_NAclubman** » Wed Aug 23, 2006 1:41 am

If standard tyre is a 185/65/14, a 195/50/15 has a 3.37% smaller rolling circumfrence. A 195/55/15 however only has a 0.1% smaller circumfrence

Richee · Postby **Richee** » Wed Aug 23, 2006 7:41 am

I thought the standard size was 185/60/14 with 195/50/15 as JBT says being the appropriate upgrade

EDIT : I hope so because Mr Startrackexpress is delivering my NB8A wheels today