Difference between revisions of "Alfine 8spd internal hub"
(→Comparisons to Rohloff Speed Hub) |
(→Comparisons to Rohloff Speed Hub) |
||
| Line 46: | Line 46: | ||
[[Image:Cassette-Design-chart.gif]]<br> | [[Image:Cassette-Design-chart.gif]]<br> | ||
| − | == | + | ==The Rohloff Speed Hub== |
http://www.rohloff.de/en/products/speedhub/index.html<br> | http://www.rohloff.de/en/products/speedhub/index.html<br> | ||
http://www.rohloff.de/uploads/media/Benutzerinfo_2.13.en.pdf | http://www.rohloff.de/uploads/media/Benutzerinfo_2.13.en.pdf | ||
| Line 66: | Line 66: | ||
:Gear #13: 1.292 | :Gear #13: 1.292 | ||
:Gear #14: 1.467 | :Gear #14: 1.467 | ||
| + | ==The Sram iMotion 9== | ||
| + | http://www.sram-imotion.com/pdf/Technikfolder9_E.pdf<br> | ||
| + | http://www.sram-imotion.com/pdf/Manuals/i-MOTION-9.pdf<br> | ||
| + | http://www.sram-imotion.com/pdf/Datenblatt9_E.pdf<br> | ||
| + | |||
| + | Overall 340 % | ||
| + | 1st gear 0,542 | ||
| + | 2nd gear 0,621 | ||
| + | 3rd gear 0,727 | ||
| + | 4th gear 0,853 | ||
| + | 5th gear 1,000 | ||
| + | 6th gear 1,172 | ||
| + | 7th gear 1,375 | ||
| + | 8th gear 1,611 | ||
| + | 9th gear 1,844 | ||
==Chainring & Sprocket Choice== | ==Chainring & Sprocket Choice== | ||
Revision as of 03:46, 27 November 2008
I have a bike that I've been developing. The 28er. It is meant to be the fictional 'one bike'. A bike that can be used on road, off road, commute, full dirt. It will never exist as everyone should know, but a real bike geek will always dream of attainment.
Contents
The rise of the Alfine
Alfine is Shimano's high end cruiser parts group. 2009 brings this group to the USA. Along with it a nice internal 8spd disc hub.
Parts and Cost
- Alfine SGS501 32h Disc brake 8-spd Internal hub Black, QBP# HU7887, $275.00 (MSRP)
- Alfine SL-S500 8spd Shift lever Black, QBP# LD5705, $50.00 (MSRP)
- Alfine SG-S501 small parts kit, QBP# HU7889, $15.00 (MSRP)
- Nexus 16 tooth cog, black, QBP# FW7016
The good
The hub itself is fantastic. It works impressively well. shifting under power, while coasting, while pedaling with only minor blips. I'm hoping figuring out the cable finesse will eliminate all of those.
The bad
Almost everything about the shifter sucks. You can't remove the display, it's low normal, it doesn't have 2 way triggers, the look is just gross. Most noticable is that you are only able to shift one gear at a time. Skipping a few sometimes would make a big difference.
A drop bar hydro STI lever would rule, I'd also like to know if other 8spd STI levers will work with the system.
The hub is heavy. It's weigh in the rear is odd since I am not used to this.
I will be doing more testing to see about seals and offroad performance.
Weight
The Alfine system added 3.5 lbs to the single speed bike weight. While a bit much for pure perfomance, it is in range for someone looking for a bombproof clean drivetrain with good performance.
Gear Reduction
The Alfine
- Gear Ratio Total Difference 3.07
- Gear Ratio 1 0.527
- Gear Ratio 2 0.644
- Gear Ratio 3 0.748
- Gear Ratio 4 0.851
- Gear Ratio 5 1.0
- Gear Ratio 6 1.223
- Gear Ratio 7 1.419
- Gear Ratio 8 1.615
Below is a comparison of these reductions to other common reductions used in cassette design. The Alfine gears were multiplied by a factor of 21 to get them to start at an equivilant of 11. I also include a 6 spd cassette that I built where I learned that spacing on cassette gears should not be even. This is because fine adjustment is needed in higher gears and gross adjustment is used in lower gears.
The Rohloff Speed Hub
http://www.rohloff.de/en/products/speedhub/index.html
http://www.rohloff.de/uploads/media/Benutzerinfo_2.13.en.pdf
- Gear #1: 0.279
- Gear #2: 0.316
- Gear #3: 0.360
- Gear #4: 0.409
- Gear #5: 0.464
- Gear #6: 0.528
- Gear #7: 0.600
- Gear #8: 0.682
- Gear #9: 0.774
- Gear #10: 0.881
- Gear #11: 1.000
- Gear #12: 1.135
- Gear #13: 1.292
- Gear #14: 1.467
The Sram iMotion 9
http://www.sram-imotion.com/pdf/Technikfolder9_E.pdf
http://www.sram-imotion.com/pdf/Manuals/i-MOTION-9.pdf
http://www.sram-imotion.com/pdf/Datenblatt9_E.pdf
Overall 340 % 1st gear 0,542 2nd gear 0,621 3rd gear 0,727 4th gear 0,853 5th gear 1,000 6th gear 1,172 7th gear 1,375 8th gear 1,611 9th gear 1,844
Chainring & Sprocket Choice
I did my first ride as a commute to work. Golden Gate Bridge to Daly City. A perfect sample of San Francisco riding.
I had 32/16 primary gearing with the absolute worst tires for this test, 700x45c knobbies.
The gearing range was near perfect. For street use, I suspect that 34/16 will be really nice with 700x38 slicks, possibly taller.
I will test the 32/16 offroad this weekend.
Cable and Housing
I noticed that the stock cable housing was totally dry out of the box. I lubed the cable with Shimano Special Grease for SP41. That should help from the get go. I also used a sealed end with a grommet at the hub end. I do this on all my cable runs. Makes a huge difference in the life of the housing.
http://img1.qbp.com/6SPsvm45/prodl/LU8403.jpg Shimano SIS SP41 Grease, 50g, Y04180000
http://img1.qbp.com/6SPsvm45/prodl/CA1067.jpg
Shimano 4mm sealed end caps, Y6AM98080
Servicing and Special Tools
Shifting
TL-AF10 opens the hub for servicing the shifting.
Bearings
Technical Dopcumentation
SG-S501 8-Speed Internal Hub Gear
http://techdocs.shimano.com/media/techdocs/content/cycle/EV/bikecomponents/SG/EV-SG-S501-2788A_v1_m56577569830646705.pdf
http://techdocs.shimano.com/media/techdocs/content/cycle/SI/37N0A-001_SG-S501/37N0A-001_SG-S501-EN_v1_m56577569830638091.pdf
SL-S500 Shift Lever
http://techdocs.shimano.com/media/techdocs/content/cycle/EV/bikecomponents/SL/EV-SL-S500-2631A_v1_m56577569830625646.pdf
http://techdocs.shimano.com/media/techdocs/content/cycle/SI/ALfine/SL-S500/6M20A-SL-S500-EN_v1_m56577569830599923.pdf
Images
