Im so close to finishing off this Marcargi Slugo SS with a 4 stroke shift kit,however the bottom bracket cartridge isn't the right width for this monster. I cant get a straight answer out of elitist bicycle shops,maybe one of you can help me find what i need. from the outside lip to the other lip of the bottom bracket is roughly (Fig.A in pic) 5in or 127mm. from the tip of the spindle/shaft where the crank arms mount is roughly (Fig.B) 10in or 254mm. the shaft has to have a key way in it for SBP's freewheel/sprocket. Also the distance between the bottom bracket and crank arm (Fig.C) is about 2 1/2in to 3in or 63mm to 76mm and needs that space to adjust for the freewheel sprocket. because the fat tire, i have to bring the freewheel sprocket out about an inch or 2 away from the bottom bracket so the chain can clear the tire. I cant find anything like that anywhere. whats happening is the one that came with my shift kit is too short,and only screws into the bracket about half way, the solution i was told was to stuff washers in to fill the rest of the distance towards the outside of the bracket.This has cause the whole crank/spindle to torque and tweak up and down when I give the bike gas, because there is no bearing on the other side to keep the spindle from "flopping" around when under load/stress.