Difference between revisions of "Bottom Bracket Options"
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Dura-Ace. SM-FC7800-P | Dura-Ace. SM-FC7800-P | ||
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| + | http://techdocs.shimano.com/media/techdocs/content/cycle/EV/bikecomponents/BB/EV-SM-BB91-2987_v1_m56577569830682102.pdf | ||
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| + | *SM-BB91-41A, MTB, Sealed, I-SMBB9141A | ||
| + | *SM-BB91-41B, RD, Sealed, I-SMBB9141B | ||
| + | *SM-BB91-42A, Unsealed, I-SMBB9142A | ||
| + | |||
| + | |||
| + | xtr - SM-FCM970 PRESS FIT w/ inner cover | ||
| + | dura-ace - SM-FC7800 PRESS FIT | ||
Allows for full carbon bottom bracket shells. | Allows for full carbon bottom bracket shells. | ||
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==Shell Design== | ==Shell Design== | ||
| − | *Road, 86.5mm shell | + | *Road, 86.5mm shell (symetrical) |
| − | *MTB, 92mm shell | + | *MTB, 92mm shell (offset 2.5mm on drive side) |
| − | *MTB, 89.5mm shell with | + | or |
| + | *MTB, 89.5mm shell with a 2.5mm spacer on right side | ||
If the shell is not sealed, an inner cover is needed: | If the shell is not sealed, an inner cover is needed: | ||
| Line 30: | Line 41: | ||
The inside of the shell needs a 41mm diameter 9.3mm deep ream on each side. | The inside of the shell needs a 41mm diameter 9.3mm deep ream on each side. | ||
| + | |||
==Reaming and Facing the Shell== | ==Reaming and Facing the Shell== | ||
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[[Image:Hollowtech2-shell-2.jpg]]<br><br> | [[Image:Hollowtech2-shell-2.jpg]]<br><br> | ||
[[Image:Hollowtech2-shell-3.jpg]]<br><br> | [[Image:Hollowtech2-shell-3.jpg]]<br><br> | ||
| + | |||
| + | ==Other Systems== | ||
| + | |||
| + | http://www.velonews.com/article/85518 | ||
[[category:Bicycle]] | [[category:Bicycle]] | ||
[[category:Frame Building]] | [[category:Frame Building]] | ||
Latest revision as of 18:00, 4 October 2010
Shimano Press-fit
Sleeve option - #ISMFCM970P
New Press-fit Bottom bracket from shimano. Dura-Ace. SM-FC7800-P. Retail, about $30 a set.
Shimano's new press fit BB will allow for a bunch more options with bottom bracket widths and walls.
Dura-Ace. SM-FC7800-P
- SM-BB91-41A, MTB, Sealed, I-SMBB9141A
- SM-BB91-41B, RD, Sealed, I-SMBB9141B
- SM-BB91-42A, Unsealed, I-SMBB9142A
xtr - SM-FCM970 PRESS FIT w/ inner cover
dura-ace - SM-FC7800 PRESS FIT
Allows for full carbon bottom bracket shells.
Wider shell spacing for improved suspension designs.
press releases say that scott has exclusive rights in the first year, but we all know how the bike industry really works. Yeti already has show bikes with it. The AS-R.
Shell Design
- Road, 86.5mm shell (symetrical)
- MTB, 92mm shell (offset 2.5mm on drive side)
or
- MTB, 89.5mm shell with a 2.5mm spacer on right side
If the shell is not sealed, an inner cover is needed:
- Road, FC-7800 Inner Cover
- MTB, FC-M960 Inner Cover
The inside of the shell needs a 41mm diameter 9.3mm deep ream on each side.
Reaming and Facing the Shell
I need to order a 1.625" reamer from KBC ($140.10)
Once that comes in, it will be reground to 41mm at:
Pacific Reamer & Cutter Service
4115 Broadway
Oakland, CA 94611
(510) 654-1844
Expensive? Yes.
Pics
