Monday, Oct 29, 2007 at 21:23
The reason the ply rating is not actual layers these days is that technology has moved
well ahead of canvas layers crossed at 40 degrees to each other... but the ply rating was the common point of comparison. (Thank God I say, but Willem will differ)
The load rating, however, has largely replaced it in purpose, and is more relevant.
It really feels like you need to get good advice from your dealer - if it doesn't correspond with what you hear here, by all means validate it, but there are a lot of considerations.
Your activities. Your
wheels. Your
suspension. Your load. Effects of changes in rolling diameter on performance. The law. How much space you have in your wheel
well... to name a few.
You get a little clearance with bigger tyres.
You gain a little load bearing capacity usually with bigger tyres.
You add a little extra unsprung weight with bigger tyres.
You get a little higher gearing from bigger tyres.
You lose a little power (effectively) with bigger tyres.
You pay a little extra with bigger tyres.
For me, I drive larger than standard tyres on my 100 series 1HZ - I run Cooper STTs (John R from Vic thinks this is a paid advert so I'll get my money's worth) and LT285/75R16 specifically. I put up with the higher gearing, the speedo under-reporting, and slow driving up the bigger hills... and I get to take the cruiser anywhere I have wanted to.
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