Shimano Nexus und Alfine Acht-Gang-Naben: Unterschied zwischen den Versionen

Shimano Nexus und Alfine Acht-Gang-Naben (Quelltext anzeigen)

Version vom 17. April 2019, 13:58 Uhr

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Bikegeissel

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   The Alfine SG-S500-based models (hubs and wheelsets) have an 'A' and a 'B' version.  The 'A' versions are 'two-roller' internals, i.e. they use a pawl drive on the right-hand side (in 1-4) and the main (body center) roller clutch is preloaded by a drag spring that is set into the hub shell (as also found found in most of the coaster brake versions as well as Nexus hubs with pawl drive e.g., SG-8R25, SG-8R27).<br><br>(The image at the left shows the drag spring as it slips into the hub shell. The part number for the drag spring is the same for the Alfine as for some coaster brake hubs).<br><br>A difference in the SG-S500-A hubs (and some Nexus models) is that the roller retainer is castellated (has points which protrude to the left to engage the drag spring) whereas the Nexus SG-8R25, SG-8R27 (Rollerbrake/brakeless also, later coaster-brake and Alfine) hubs have no castellations on the roller retainer. Instead, there are protrusions on the carrier unit. The castellations, when present, are easily damaged.<br><br>A parts list for the SG-S500 'A' version formerly on the Paul Lange site (now in the Internet Archive) helpfully indicates compatibility with some Nexus 8 hub variants.<br><br>There is considerable compatibility between shells and internals provided the number of roller clutches is the same. However whilst you can usually fit a tension-spring preload clutch internal into one that was originally fitted with a drag spring, you do need to remove the drag spring. If you try to fit a drag-spring preload clutch internal into a hub shell that wasn't originally fitted with one, there usually is no place to fit the drag spring, and the centre clutch won't work reliably, perhaps at all.
-Nexus and Alfine axlesWhile the axle assemblies are mostly identical, a section of the left end of the Alfine axle shown, as well as others, is fatter to withstand the bending moment from the optional disc brake, as shown in the image at the right (courtesy Aaron's Bike Repair). The Alfine left bearing cone threads onto the wider part of the axle. The Alfine requires a wider overlocknut distance than the Nexus without Rollerbrake. There are several different left-bearing-cone part numbers. Mix and match at your own risk.
+[[Datei:Nexusvsalfineaxleunitsm.jpg|right|Nexus und Alfine Achsen]]While the axle assemblies are mostly identical, a section of the left end of the Alfine axle shown, as well as others, is fatter to withstand the bending moment from the optional disc brake, as shown in the image at the right (courtesy Aaron's Bike Repair). The Alfine left bearing cone threads onto the wider part of the axle. The Alfine requires a wider overlocknut distance than the Nexus without Rollerbrake. There are several different left-bearing-cone part numbers. Mix and match at your own risk.
 The Rollerbrake and coaster brake are weatherproof, but drag slightly when not engaged, so if efficiency is a concern, avoid them. They also overheat when used on long downhill runs. We don't know for sure whether any coaster-brake model has needle-bearing pinions, but it appears not.