(rhymes with spook)
Join Date: Aug 2009
Location: Winslow, AR
Posts: 2,788
Bikes: '83 univega gran turismo x2, '85 schwinn super le tour,'89 miyata triple cross, '91 GT tequesta, '90 yokota grizzly peak, '94 GT backwoods, '95'ish scott tampico, '98 bonty privateer, '93 mongoose crossway 625, '98 parkpre ariel, 2k'ish giant fcr3
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Ever modified a crank to add a granny?
member merziac posted some pics of his merz mtb with a modified dura ace crank making it a triple. seems like a neat idea. certainly looks nice! but, it got me to thinkin'
i've got two early 80's SR super custom cranksets with a 118bcd and the smallest ring you can run is 36t. even with a larger cog of 34t, that's still not real low for big hills around here. so, since i have two, it occurred to me i could try modifying the spider of one to fit a 74bcd inner to make a triple
i have a drill press, tapping tools, good bits, a vice, metric measuring tools, ring spacers and bolts.....basically everything i would think i'd need to try it. thing is, i believe there's a probably a good efficient way to go about doing this since it's obviously been done. no need to reinvent, and i could hopefully avoid mistakes. for example, what's an effective way to secure the part and make sure the holes are drilled evenly/straight and properly centered? and, of course, if there's design considerations of the part that might lead to failure, i'll have to reconsider this attempt
as always, thanks!!!
ps. i know...it'd be much easier to use a same period triple crank to achieve desired gearing, and for now i'm doing that. but, it think it'd be swell to run the original SR. i've got several 118 rings for it, too