Re: kent siesta key 7 spd crusier??
Hi. Yes I have that bicycle. They seem adequate for a GEBE or EZM kit. I think mine came with a sticker that said: "TIG Welded 1020 steel". I installed the kits carefully and I go at 22mph or less. The tensioner for EZM: I up-graded the bolts and clamp them very tight to the chain stay and twisted the longer piece of steel slightly (with vice-grips) to align the tensioner wheel with the pirate sprocket. The bicycle is $160 on sale for $120. I would not drill that thing, I don't know about welding anything to that chain stay either. I don't think you should run at 30-35mph with the China two stroke happy time on that bicycle for more than a couple seconds at a time, it might shake or crack.