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The quality of cotters available to most bike shops from the major suppliers is pretty sad. (See Grade D below) So, I am always on the lookout for any high quality ones that might still be out there.
Grade A cotters I import these directly from the manufacturer in France. They are fully machined from 3/8" (9.5mm) or 9.0mm steel. Both ends are domed to prevent mushrooming when they are installed or removed. The threaded stems are larger, 7mm and the washers are thicker and harder.When you compare the moments of inertia for the actual root diameters of rolled 6mm and 7mm threads, you see that the larger threads have twice the resistance to bending. This is irrelevant in use, but potentially a big deal when trying to remove them.
9.5mm English Grade A
1 - Modified (Raleigh) cut $4.50 each - Cut is 27mm long and 2 mm deep - 7mm stem
I do not have any cotters that will accept Raleigh "R" nuts.
2 - Original cut $3.00 each - Cut is 18-20mm long and 1.35-1.45mm deep - 7mm stem
3 - Grade "B" 9.5mm $2.25 each. 6mm Stem, but at least the ends are domed.
The 9.5mm Grade A cotters are not cut deeply enough to be a good fit for Raleighs. For non-Raleigh owners, this is a good thing. Cotters cut to fit Raleighs go in too far for other cranks. Filing cotters to fit whatever cranks you are working on used to be the norm.
These days, not everyone is comfortable trying to file a pair of cotters to the correct depth and and at the same angle. So, I made a fixture that allows me to accurately machine them to be a good fit for the typical Raleigh crank. Unfortunately modifying the cotters eats up time, so I have to charge $4.50 each for the modified ones vs. $3.00 for the unmodified cotters.
9.0mm "French" Cotters are $5.00 each
5 - Peugeot Cut : Shown here just for illustration, I haven't seen any for sale in a decade. Cut runs full length of the cotter and is about 3mm wide at the end. The offset between the spindle bore and the cotter bore is less than other cranks. So there isn't room for a 7mm stem to pass through the cotter bore and clear the spindle. Peugeot cotters have a 6.5mm stem.
Or you could get a standard 7mm stem 9mm cotter and file it down and file just enough of threads down to insert it. My setup for modifying 9.5mm cotters won't work for making Peugeot compatible cotters.
Not all Peugeots take the“Peugeot Cut”cotters. Some with Nervar cranks take a ¾ cut and they may require some filing to fit. Do the flats on your current cotters extend all the way to the end, like the “Peugeot Cut” cotter shown above?
|For 8.0mm and 8.5mm cotters try Bike
Tools Etc. |
Get their "Machined" cotters. Their "Stamped" cotters are like the Grade Ds shown below.
These are what the major importers are bringing in today. The newest cotters are just pinched off a piece of rod, rolled and mashed into a usable shape. Since the bevel is just stomped into place, there is a bulge at the sides. So they have to use undersized, 9.2mm or 8.7mm rod so the bulge won't keep them from fitting into a 9.5mm or 9.0mm hole.