.... mine are KUMHO's, but most all tires are within a few mm of each other when it comes to size, so don't fret....
I'm sorry, but that's just not true! There can be fairly significant diameter & width differences between different brands or types of tires showing the same nominal size on their sidewalls - occasionally even as much as 18mm difference!!
This most often occurs when comparing different brands of tires, because some manufacturers generally use the treadless casing size as the basis for their nominal size & then they add the tread layers; while other manufacturers may use the fully assembled tire
including the tread layers as the basis for their nominal size; but it does also sometimes happen with tires supposedly the same size running different tread patterns from the same manufacturer. I certainly agree that these nominal sidewall sizes SHOULD only be applied to tires within just a few mm of each other, making it safe to use the nominal sizes shown on the sidewall when comparing tires, but I can tell you from personal & expensive experience that it is NOT!!
pps:
Sure, the nominal sizes on the sidewall are a good place to
start when you are comparing tires, & those internet comparison charts & calculators come in handy to do that; but where space may be tight, it's best to compare the ACTUAL physical dimensions of the tire you
want to fit against those of a tire you
know will fit - doing anything else can be risky. (Most Tire Manufacturers publish the physical dimensions of each of their tires, along with load & speed ratings, etc.)
Yeah, sometimes you might get lucky just going off the nominal size, but do you really want to buy a set of tires based on the nominal size shown on the sidewall because that size matches the size of some other brand of tire that someone else used, only to find that the tire you have now paid for & fitted is maybe 10-18mm different in rolling diameter?? Is there really 18mm or 3/4 if an inch of extra space under those fenders?? Maybe it'd be smarter to check that someone else has actually fitted that particular tire size & brand/tread pattern on their same model Spyder & that it does fit, so you can then be confident that it will work for you too; or can you afford or want to have your Spyder off the road while you play around buying a set of tires & getting them fitted to your rims only to find that they just won't fit under the fenders?? :gaah:
