What kind of bottom bracket is this?
01-28-14, 06:48 PM
#27
working on my sandal tan
Join Date: Aug 2011
Location: CID
Posts: 22,629
Bikes: 1991 Bianchi Eros, 1964 Armstrong, 1988 Diamondback Ascent, 1988 Bianchi Premio, 1987 Bianchi Sport SX, 1980s Raleigh mixte (hers), All-City Space Horse (hers)
Mentioned: 98 Post(s)
Tagged: 0 Thread(s)
Quoted: 3871 Post(s)
Liked 2,568 Times
in
1,579 Posts
Hahaha..... You would spend a bunch of your time if you posted this in every thread where someone wants to replace a component, and they were looking at lighter options, even if the rider's level of performance doesn't warrant the "upgrade".
Unfortunately for me, the marketing of nice bike-stuff is equally as effective as the marketing of fast-food. My job.... don't get carried away with either one!
Unfortunately for me, the marketing of nice bike-stuff is equally as effective as the marketing of fast-food. My job.... don't get carried away with either one!
01-29-14, 11:50 AM
#28
Member
Thread Starter
Join Date: Jul 2005
Posts: 41
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
I definitely understand your point, Thermionic. I'm pretty sure I could get all the bike I need for $500. Anything beyond that is just a want or desire, with only marginal improvement that I could ever take advantage of.
At least I'm not kidding myself, thinking I need this stuff!
At least I'm not kidding myself, thinking I need this stuff!
01-31-14, 04:55 PM
#29
Member
Thread Starter
Join Date: Jul 2005
Posts: 41
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
Postman has brought the new gear. I'll be dropping 310 grams (11 oz)(2-3 swigs from a water bottle...
) when it's installed.
) when it's installed.Last edited by TeamCNY; 01-31-14 at 04:58 PM.
01-31-14, 08:37 PM
#30
Senior Member
Join Date: Apr 2010
Location: Mountain View, CA USA and Golden, CO USA
Posts: 6,341
Bikes: 97 Litespeed, 50-39-30x13-26 10 cogs, Campagnolo Ultrashift, retroreflective rims on SON28/PowerTap hubs
Mentioned: 9 Post(s)
Tagged: 0 Thread(s)
Quoted: 550 Post(s)
Liked 325 Times
in
226 Posts
I have cranks (SLK and SLK Light) taking two different width MegaExo bottom brackets.
Those made for solid arm carbon cranks (SLK not "light") have a wider non-drive side bearing which mates to their longer axle and thinner arm. The BB-8000 is the affordable steel bearing variant.
Those made for the "Light" hollow arm carbon cranks (SLK Light, K-Force Light) have a thinner non-drive bearing cup to accommodate the crankset with a shorter axle and thicker arm. The BB-8681 is the affordable steel bearing version
and there's a newer BB-8681/DI2 with the same cups but a thinner spacer making room for internal cables
FSA sells at least two other types of MegaExo bottom brackets which pair with alloy cranks and I wouldn't be surprised to see similar differences (maybe due to arm size, maybe due to the angle sort of like how low profile Record/Chorus square taper cranks took a narrow 102mm axle while the others took a 111 or 115mm axle).
Last edited by Drew Eckhardt; 01-31-14 at 08:44 PM.
01-31-14, 08:46 PM
#31
Cottered Crank
Join Date: Aug 2010
Location: Chicago
Posts: 3,401
Bikes: 1954 Raleigh Sports 1974 Raleigh Competition 1969 Raleigh Twenty 1964 Raleigh LTD-3
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 8 Post(s)
Likes: 0
Liked 11 Times
in
7 Posts
It's not.
There are at least two different MegaExo bottom bracket widths (I've had them side-by side after some one sold me a second hand SLK-Light crank with the SLK bottom bracket):
Those made for non-Light (SLK, K-Force) solid arm carbon cranks have a wider non-drive side bearing which mates to their longer axle and thinner arm. The BB-8000 is the affordable steel bearing variant.
Those made for the "Light" (SLK-Light, K-Force light) hollow arm carbon cranks have a thinner non-drive bearing cup to accommodate the crankset with a shorter axle and thicker arm. The BB-8681 is the affordable steel bearing version
and there's a newer BB-8681/DI2 with the same cups but a thinner spacer making room for internal cables
FSA sells at least two other types of MegaExo bottom brackets which pair with alloy cranks and I wouldn't be surprised to see similar differences (maybe due to arm size, maybe due to the angle sort of like how low profile Record/Chorus square taper cranks took a narrow 102mm axle while the others took a 111 or 115mm axle).
There are at least two different MegaExo bottom bracket widths (I've had them side-by side after some one sold me a second hand SLK-Light crank with the SLK bottom bracket):
Those made for non-Light (SLK, K-Force) solid arm carbon cranks have a wider non-drive side bearing which mates to their longer axle and thinner arm. The BB-8000 is the affordable steel bearing variant.
Those made for the "Light" (SLK-Light, K-Force light) hollow arm carbon cranks have a thinner non-drive bearing cup to accommodate the crankset with a shorter axle and thicker arm. The BB-8681 is the affordable steel bearing version
and there's a newer BB-8681/DI2 with the same cups but a thinner spacer making room for internal cables
FSA sells at least two other types of MegaExo bottom brackets which pair with alloy cranks and I wouldn't be surprised to see similar differences (maybe due to arm size, maybe due to the angle sort of like how low profile Record/Chorus square taper cranks took a narrow 102mm axle while the others took a 111 or 115mm axle).
I do know that my FSA Gossamer MegaEXO triple works just fine with regular Shimano-spec cups. I'm running a Dura Ace BB on it right now.
02-01-14, 07:52 PM
#32
Member
Thread Starter
Join Date: Jul 2005
Posts: 41
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
Installed.
Thanks to everyone who helped in this thread. It will be months before I get to ride this on the road.
Drew, thank you for the bearing info. I can't imagine that (for me) the difference between the steel bearings and ceramic makes it worth using ceramic replacements, when the time comes.
My fish-scale says I'm at 18.1 lbs (if anyone cares).
Thanks to everyone who helped in this thread. It will be months before I get to ride this on the road.
Drew, thank you for the bearing info. I can't imagine that (for me) the difference between the steel bearings and ceramic makes it worth using ceramic replacements, when the time comes.
My fish-scale says I'm at 18.1 lbs (if anyone cares).
Last edited by TeamCNY; 02-01-14 at 07:59 PM.
Thread
Thread Starter
Forum
Replies
Last Post
shoota
Cyclocross and Gravelbiking (Recreational)
4
08-20-13 10:11 AM
