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SRAM G8 und G9 Nabenschaltungen: Unterschied zwischen den Versionen
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SRAM G8 und G9 Nabenschaltungen (Quelltext anzeigen)
Version vom 9. Oktober 2019, 11:18 Uhr
, 9. Oktober 2019→Versionen und Übersetzungen: Tabelle
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(→Versionen und Übersetzungen: Tabelle) |
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Drive ratios (in italic for the G9 only) are: | Drive ratios (in italic for the G9 only) are: | ||
{| class="wikitable" | |||
|- | |||
|colspan=2|'''Übersetzung''' | |||
|colspan=2|''0,541'' | |||
|colspan=2|0,609 | |||
|colspan=2|0,710 | |||
|colspan=2|0,803 | |||
|colspan=2|0,903 | |||
|colspan=2|1,054 | |||
|colspan=2|1,204 | |||
|colspan=2|1,355 | |||
|colspan=2|1,581 | |||
|- | |||
|colspan=3|'''Abstufung''' | |||
|colspan=2|''12,5% '' | |||
|colspan=2|16,7% | |||
|colspan=2|13,1% | |||
|colspan=2|12,5% | |||
|colspan=2|16,7% | |||
|colspan=2|14,3% | |||
|colspan=2|12,5% | |||
|colspan=2|16,7% | |||
|} | |||
The internals of the G8 and G9 are substantially the same. The G9 offers one additional low gear which is theoretically possible but not implemented in the G8. The G8's total range is narrower than that of 8-speed hubs from Shimano and Sturmey-Archer, 259% with an even series of small steps. The G8 is, then, best suited to urban cycling without steep climbs and to cyclists who are picky about cadence. The G9's range is 292%, still slightly narrower than that of the Shimano 8-speed. | The internals of the G8 and G9 are substantially the same. The G9 offers one additional low gear which is theoretically possible but not implemented in the G8. The G8's total range is narrower than that of 8-speed hubs from Shimano and Sturmey-Archer, 259% with an even series of small steps. The G8 is, then, best suited to urban cycling without steep climbs and to cyclists who are picky about cadence. The G9's range is 292%, still slightly narrower than that of the Shimano 8-speed. | ||
The shell of G8 and G9 is somewhat larger than that of the discontinued i-Motion 9, but the internal mechanism is much simpler, and the G8 and G9 weigh less. | The shell of G8 and G9 is somewhat larger than that of the discontinued i-Motion 9, but the internal mechanism is much simpler, and the G8 and G9 weigh less. | ||
==Technische Dokumentation== | ==Technische Dokumentation== | ||
| Zeile 77: | Zeile 99: | ||
The illustration below, from SRAM, (in my translation from the German) is a schematic diagram of the gearing. "Z" in the diagram stands for "Zähne", which is German for "teeth." The coaster brake is driven independently of the gearing, good because then the brake works the same in every gear. A coaster brake in an internally-geared hub is, however, a bad idea even though it is popular in some parts of the world. | The illustration below, from SRAM, (in my translation from the German) is a schematic diagram of the gearing. "Z" in the diagram stands for "Zähne", which is German for "teeth." The coaster brake is driven independently of the gearing, good because then the brake works the same in every gear. A coaster brake in an internally-geared hub is, however, a bad idea even though it is popular in some parts of the world. | ||
[[Datei:G8diagramger.png|center|Schmatisches Diagramm der G8 Schaltung]] | |||
The internal mechanism of the coaster-brake G8 is shown in the view below. The parts are in the same orientation as in the diagram above. The 48-tooth sun gear (at the gap in the middle of the hub) and the brake shoes have been removed. Sectors of the shell, ring gears, planet cages and driver have been cut away. Plastic dropouts as shown are recommended only for light service! | The internal mechanism of the coaster-brake G8 is shown in the view below. The parts are in the same orientation as in the diagram above. The 48-tooth sun gear (at the gap in the middle of the hub) and the brake shoes have been removed. Sectors of the shell, ring gears, planet cages and driver have been cut away. Plastic dropouts as shown are recommended only for light service! | ||
G8 internals | [[Datei:G8-internals.JPG|center|Das Innenleben einer G8 Nabe]] | ||
===Innenleben=== | ===Innenleben=== | ||
G8 | [[Datei:G8sungears.JPG|right|G8 Sonnenräder]] | ||
The photo at the right shows the axle assembly with some additional parts. The left end of the axle is at the top. The 54- and 57-tooth sun gears of the first stage are in place; the remaining sun gears have been lifted off. Just above the 54-tooth sun gear is a pawl to block rearward rotation of the (absent) 48-tooth sun gear. Pawls which block forward rotation of the two sun gears of the second stage are nearer the top of the picture. It may look as though there are more pawls, but each pawl is grooved in the middle for its pawl spring. | The photo at the right shows the axle assembly with some additional parts. The left end of the axle is at the top. The 54- and 57-tooth sun gears of the first stage are in place; the remaining sun gears have been lifted off. Just above the 54-tooth sun gear is a pawl to block rearward rotation of the (absent) 48-tooth sun gear. Pawls which block forward rotation of the two sun gears of the second stage are nearer the top of the picture. It may look as though there are more pawls, but each pawl is grooved in the middle for its pawl spring. | ||
