Bryan wrote on 08/18/09 at 16:23:21: I'd consider buying a 140/90, but I really don't want to throw off my speedo, even a little bit, if I can help it.
The speedo is the least reason I can think of to buy one tire over another. If you want accuracy, get a bicycle speedo, or some other electronic variant that you can dial in to the tire you DO put on. OR, just put on the tire that works right for you in cost, performance, etc, and then relabel your speedo with a marker or something.
The only real issue with mounting a 140/90 is you might rub the bolts up under the fender if you have saddlebag brackets installed. If you do, grind them down or install bolt with a flatter head.