I want to lace my SA kickback hub to a 57mm rim. I'll use a 3" tire. This is the rear wheel off of Riffratt. The band brake just didn't give me enough braking, so the coaster brake will fix that and I'll have 2 speeds to boot. I can't get any 32 spoke wide rims here and that's what the kickback hub has, 32 holes. The rim had 36 holes. I've researched the internet and found there aren't any good ways to lace the two together and be reliable. My hub uses a coaster brake so it has to be strong. 3 cross will be the pattern I use, as the freewheel hub on there now is the same size as the kickback hub, so the spokes are reusable.
I did a lot of measuring and calculating and came up with an idea. I can drill out the rim as if it was made for 32 spokes. The problem would be if the holes were too close together when drilled out, making some potentially weak points. But I measured the diameter, calculated the circumference and found out the spacing for 36 and 32 holes for that size rim.
The space between spokes on a 36 hole version of this wheel is 46.7mm, for 32 it's 53.0mm. I calculated to the tenth of a millimeter. Four of the holes match up within a half millimeter, the 8th, 16th, 24th, and 32nd. That only leaves 28 holes to drill to make it an evenly spaced 32 hole rim. I checked the distances between holes on both 32 and 36, none were any closer together than 5 mm, and that was only a couple of them. Most are well separated from the other holes, so I'm sure it'll work. The first set of numbers I worked up were off, the rim diameter was wrong when I first measured it.
This rim will now work for 36 and 32 hole hubs. I'll have to find a way to mark the holes for each one.
I did a lot of measuring and calculating and came up with an idea. I can drill out the rim as if it was made for 32 spokes. The problem would be if the holes were too close together when drilled out, making some potentially weak points. But I measured the diameter, calculated the circumference and found out the spacing for 36 and 32 holes for that size rim.
The space between spokes on a 36 hole version of this wheel is 46.7mm, for 32 it's 53.0mm. I calculated to the tenth of a millimeter. Four of the holes match up within a half millimeter, the 8th, 16th, 24th, and 32nd. That only leaves 28 holes to drill to make it an evenly spaced 32 hole rim. I checked the distances between holes on both 32 and 36, none were any closer together than 5 mm, and that was only a couple of them. Most are well separated from the other holes, so I'm sure it'll work. The first set of numbers I worked up were off, the rim diameter was wrong when I first measured it.
This rim will now work for 36 and 32 hole hubs. I'll have to find a way to mark the holes for each one.