Join Date: May 2008
Location: Royal Palm Beach, Florida
Bikes: 2006 Co-Motion Roadster (Flat Bars, Discs, Carbon Fork), Some 1/2 bikes and a couple of KTM's
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You could narrow a Cannondale without too much effort. Find some 7.5 mm aluminum plate, or have some machined to thickness. Use something fairly strong, at a minimum 6061 t651. 2024 t351 or 7075 series would be stronger. Using the oem dropout as a pattern, replicate that on your new plates. Using existing frame holes, you can secure these new plates to the oem dropouts. I will recommend some quality fasteners, not an inferior product but a true American made allen head bolt. You may need to use flush screws and a step for the der hanger, possibly it could sandwich between the dropouts , should not be a big deal to machine.
Obviously running a 145 axle is optimum, however the 130 should be fine using a 145 quick release.
This is not a simple bike shop project or for someone with lacking fabrication skills. A decent machinist or tinkerer with a Bridgeport could get this done pretty quick.