I'm thinking of getting a marinobike frame made, and thought that it'd be nice not to have to run a tentioner. I've seen a few people without tentioners, on stocks, so I was just wondering if anyone knew how long the chainstays on whatever frame it is are, and what gear ratio they were running. Ideally, I'd like to run 22:18, but 18:15 would be Ok too. If I'm wrong, and no-one's got that - could one of the mechanics/engineers on here have a crack at figuring it out? I'd do it myself - but I don't really know how :$ Cheers