Shimano FH-RM40-8 135mm Rear hub
| Hub Data | ||
|---|---|---|
| Manufacturer | Shimano | |
| Model | FH-RM40-8 | |
| Descriptor | ||
| Position | Rear | |
| Axle Type | 10mm | |
| OLN | 135 mm | |
| Spoke Interface Type | J-Bend | |
| Brake Compatibility | rim brake | |
| Drive Interface | Shimano 8/9/10/DynaSys (34.95mm) | |
| Internal Gearing | none | |
| Dynamo Type | none | |
| Spoke Hole Diameter | 2.6 mm | |
| Left Flange Diameter | 45.3 mm | |
| Right Flange Diameter | 45.3 mm | |
| Left Flange Offset | 35.8 mm | |
| Right Flange Offset | 19.8 mm | |
| Mid-Flange Offset | -8 mm (to the left) | |
| Weight | 373 g | |
| URL | ||
| Metadata | ||
|---|---|---|
| Hub ID | 272 | |
| Record Status | Public | |
| Created | Feb 24, 2014 1:15pm | |
PLEASE NOTE: Shimano publishes hub dimensions in a relatively confusing manner on bike.shimano.com. They seem to provide the outside-to-outside flange spacing, and an overall offset of the flanges as a whole. Wheelbuilders are interested in the distance from the midpoint between locknut faces to the middle of the flange (not the inside or outside face). When necessary, I convert Shimano's data into useful spoke calculation dimensions with some simple arithmetic, and factor in 3mm thick hub flanges (an approximation). The formula is to divide spacing by two, add or subtract the overall offset, then subtract half of our assumed 3mm flange thickness. Please check the notes to see if the values for this part are derived from Shimano's published data or actual measurements of a hub specimen. -Karl
A very inexpensive cassette hub with virtually no bearing seals. Not made to be pretty or durable. -Karl
9/9/19 -- I think this entry is for what is actually the FH-RM40-8 (with an 8/9/10 freehub body). Updating model name and entering a new record for the FH-RM40 (7spd freehub body) that I have on hand to measure and doesn't quite match these offsets. I suspect the two are the same base hub shell but with a different freehub body and left side axle spacers, hence the nearly-identical model names. -Karl
9/9/19 -- I think this entry is for what is actually the FH-RM40-8 (with an 8/9/10 freehub body). Updating model name and entering a new record for the FH-RM40 (7spd freehub body) that I have on hand to measure and doesn't quite match these offsets. I suspect the two are the same base hub shell but with a different freehub body and left side axle spacers, hence the nearly-identical model names. -Karl