Aspect Ratio

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Aspect Ratio

Post  rowie on Sat Oct 10, 2009 12:23 pm

New to this forum (not new to VTXOA) and I'm thinking about the darkside as my Avon R is starting to wear out. I'm interested in what people think is the best aspect ratio for my ride ('02 1800 Retro w/cast wheels), which is largely 2-up with my wife on board. I was thinking (and might be over-thinking) based on many years of car racing experience that it would make sense to get quite a "sticky" car tire, meaning more "wet weather high ultra performance" (in cars this translates to poor tread wear but with good water clearing), and I notice that sizes for those kinds of tires seem to be in lower aspect ratios (205-50/16's mostly), like Toyo's for example. I'm kind of assuming that the lower tire load in general means the wear won't be bad on the bike vs on a car, hence better longevity - safe assumption or wrong? If I get a 50 ratio, aside from probably messing up the speedo further, by lowering by roughly 1.2 inches what happens to the handling? If bottoming out is a concern due to 2-up with bags etc. would adding 12.5" progressive springs solve that? I know a 1300 FD would help the speedo issue. Any recommendations for a tire match to my criteria that might work? Of course there's the GY TT that seems so popular - how would this compare to the logic I just laid out?

Sorry for the litany of questions, just trying to figure it all out - seems like the choices are somewhat limited by availability of the car tire sizes. I do know that while I was happy enough with the feel of the Avon R's (but I can't compare to darkside as I haven't tried it) the tire life is awful - about 5K miles so far and I reckon there's maybe another 1k in them at best and they're shot.

Thanks for your help!

rowie

Number of posts : 5
Location : Rochester NY
Registration date : 2009-09-24

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Re: Aspect Ratio

Post  nodakbassmaster on Sat Oct 10, 2009 5:18 pm

the ct's are all softer than MT's anyway. gettin into the shorter sidewalls like that will make the handling worse on a scooter. Dig into a tire calculator like Tire Calc and you will be able to compare how much farther off your speedo and odo will be. That would be a pretty decent change and I would think it would raise your RPM's a bit, the 1300 final drive is only good for an adjustment of a couple hundred RPM from my experience and won't help much...

the Hydroedge or tripletread in a 205/60 or a 205/65 are proven performers for other members...

hope that helps...

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Re: Aspect Ratio

Post  rowie on Sun Dec 06, 2009 2:07 pm

Thanks for this. So is it safe to say based on aspect ratio that a 205-65/16 (Michelin Hydroedge comes in this size) will handle marginally better than a 205-60/16 (Goodyear Triple Tread and General comes in this size - can't find either one at the 65 aspect ratio)? Just trying to figure out (aside from speedo difference) whether for 2-up riding, which I do more than 1-up, a Hydroedge will be a marginally better ride. I'm leaning towards the Hydroedge for this reason but want to be sure my logic isn't weird.....!! I also see the HydroEdge is a "T" speed rating vs the Goodyear has an "H" rating, and the Hydroedge is a significantly lighter tire than the GYTT. Almost too many options here - reading the board it's starting to sound like it's hard to tell the difference...... maybe higher speed rating is a smarter choice - not sure. Thanks for your help so far!

rowie

Number of posts : 5
Location : Rochester NY
Registration date : 2009-09-24

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