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[Tweetys_Revenge]

I know nothing about metric tires I always buy what is already on the Car/truck with that said I have a MC tire question .Whats the difference between a stock 180-70-16 which is on my 1800R and a 200/60/16 which seems to be what people step up to when its time for a new rear tire is it more of a looks thing or is there an advantage to a bigger tire.

[Luckys Lover]

The tire numbers are width- height RATIO and rim size.

So the 200/60/16 is a little wider and a little shorter than the 180/70/16.

I say "a little shorter" because the height of the 200/60 is 120 mm tall and the 180/70 is 126 mm tall.

Personally, I think it's mostly a LOOKS thing. On heavier vehicles, it's a capacity thing. For instance, on my boat trailer, the 180 supports 1740 lbs while the 205 supports 1860 lbs at 50psi. And because my boat and gear weighs in close to 3300 lbs, I need two 1860lbs tires to keep rolling down the freeway. I learned this the hard way with a tire blowing out on me on a trip...... the third time.... sheesh. slow learner. 

[Silver Bullet]

On heavier vehicles, it's a capacity thing. For instance, on my boat trailer, the 180 supports 1740 lbs while the 205 supports 1860 lbs at 50psi. And because my boat and gear weighs in close to 3300 lbs, I need two 1860lbs tires to keep rolling down the freeway. I learned this the hard way with a tire blowing out on me on a trip...... the third time.... sheesh. slow learner. 

Actually the tire size does not guarantee a load capacity. There is a separate numeric load rating number on tires. It is before the speed rating letter, i.e. 89H
89= load rating
H= speed rating

Here is a link to all tire ratings:
http://www.tirerack.com/tires/tiretech/techpage.jsp?techid=35


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[bigdog]

and as it shows H is only 130 mph