BB replacement question
10-11-15 | 07:00 AM
#1
Thread Starter
Senior Member
Joined: Dec 2011
Posts: 2,928
Likes: 253
From: NE Ohio
Bikes: 1992 Serotta Colorado II,Co-Motion Speedster, Giant Escape Hybrid, 1977 Schwinn Super Le Tour
BB replacement question
I have a BB-7000 on our Co-Motion Tandem that will need replacing. The crankset is a FSA Mega Exo. Is the BB-7000 the only "model" I can use?
Thanks!
Thanks!
10-11-15 | 07:06 AM
#2
Thread Starter
Senior Member
Joined: Dec 2011
Posts: 2,928
Likes: 253
From: NE Ohio
Bikes: 1992 Serotta Colorado II,Co-Motion Speedster, Giant Escape Hybrid, 1977 Schwinn Super Le Tour
I think I may have figured it out! I think all I need to do is measure vthe BB she'll on the frame. Correct?
10-11-15 | 08:39 AM
#3
Senior Member
Joined: Feb 2012
Posts: 19,381
Likes: 5,527
From: Rochester, NY
Bikes: Stewart S&S coupled sport tourer, Stewart Sunday light, Stewart Commuting, Stewart Touring, Co Motion Tandem, Stewart 3-Spd, Stewart Track, Fuji Finest, Mongoose Tomac ATB, GT Bravado ATB, JCP Folder, Stewart 650B ATB
Generally the Bb axle length is also needing to be measured. Especially on a tandem which can have longer the typical BB axles to allow for a triple and LH timing chainring. Andy.
10-11-15 | 09:36 AM
#4
Senior Member
Joined: Jun 2012
Posts: 854
Likes: 1
From: Central Ohio
Bikes: All 80s Schwinns: 88Prologue, 88Circuit, 88Ontare, 88KOM, 86SS, 88Tempo, 88V'ger, 80V'ger, 88LeTour, 82LTLuxeMixte, 87 Cimarron, 86H.Sierra, 92Paramount9c
Tandem Tom, I'm new to bottom brackets but was just recently researching Mega-Exos. So I'm no pro but it seemed that in my reading there were some that were compatible with Shimano hollowtech II bottom brackets but it was hit and miss. I think the difference was the FSA aluminum road cranks were Shimano-compatible but carbon ones were not. Like the carbon ones were a fraction of a millimeter larger bore or something like that. However, the BB-7000 appears to be for their mountain cranks so I'm not sure. What crankset do you have ("Mega-Exo" is not the model of crankset but the style of the bottom bracket interface)?
Last edited by T Stew; 10-11-15 at 09:39 AM.
10-11-15 | 09:47 AM
#5
Senior Member
Joined: Oct 2004
Posts: 3,248
Likes: 4
From: Seattle
Bikes: Kuota Ksano. Litespeed T5 gravel - brilliant!
TT, see if you can make use of this... https://www.stilen.com/bike_stuff/Meg...l_040820-1.pdf
10-11-15 | 10:53 AM
#6
Senior Member
Joined: Apr 2015
Posts: 1,102
Likes: 2
From: Morris County, NJ
Bikes: 90's Bianchi Premio, Raleigh-framed fixed gear, Trek 3500, Centurion hybrid, Dunelt 3-spd, Trek 800
You may want to check the reviews on this site: FSA BB-7000 V-Drive Mega Exo BB | Chain Reaction Cycles
You mentioned that your current BB 7000 has quit, but you didn't say how long it lasted. Others complain that it has a short life expectancy.
You mentioned that your current BB 7000 has quit, but you didn't say how long it lasted. Others complain that it has a short life expectancy.
10-11-15 | 11:06 AM
#7
Thread Starter
Senior Member
Joined: Dec 2011
Posts: 2,928
Likes: 253
From: NE Ohio
Bikes: 1992 Serotta Colorado II,Co-Motion Speedster, Giant Escape Hybrid, 1977 Schwinn Super Le Tour
I will answer both questions. The crankset is FSA Gossamer Tandem Crankset. Not sure how many miles on this BB but I rebuilt them with Phil Wood bearings. We don't put a lot of miles on but it did seem to wear out pretty fast.
After doing a bit more reading I am totally confused!! Cannot figure out what will be a good substitute. Maybe I will start another more specific thread.
After doing a bit more reading I am totally confused!! Cannot figure out what will be a good substitute. Maybe I will start another more specific thread.
Last edited by Tandem Tom; 10-11-15 at 11:21 AM.
10-11-15 | 11:30 AM
#8
Senior Member
Joined: Apr 2015
Posts: 1,102
Likes: 2
From: Morris County, NJ
Bikes: 90's Bianchi Premio, Raleigh-framed fixed gear, Trek 3500, Centurion hybrid, Dunelt 3-spd, Trek 800
I will answer both questions. The crankset is FSA Gossamer Tandem Crankset. Not sure how many miles on this BB but I rebuilt them with Phil Wood bearings. We don't put a lot of miles on but it did seem to wear out pretty fast.
After doing a bit more reading I am totally confused!! Cannot figure out what will be a good substitute. Maybe I will start another more specific thread.
After doing a bit more reading I am totally confused!! Cannot figure out what will be a good substitute. Maybe I will start another more specific thread.
BTW, Phil Wood bearings are supposed to be the best there are, yet yours quit? Hmmm....
10-11-15 | 05:40 PM
#9
Senior Member
Joined: Feb 2012
Posts: 19,381
Likes: 5,527
From: Rochester, NY
Bikes: Stewart S&S coupled sport tourer, Stewart Sunday light, Stewart Commuting, Stewart Touring, Co Motion Tandem, Stewart 3-Spd, Stewart Track, Fuji Finest, Mongoose Tomac ATB, GT Bravado ATB, JCP Folder, Stewart 650B ATB
"I don't think the BB-7000 is available in different widths, what difference would that make?" T Stew
You are right, I was thinking separate spindle VS one piece that is referenced. But in my defense much of my answers are for others too. Guess I was lost in these possible readers who might have tapered square or splined Bbs and thought only shell width was important. Andy.
You are right, I was thinking separate spindle VS one piece that is referenced. But in my defense much of my answers are for others too. Guess I was lost in these possible readers who might have tapered square or splined Bbs and thought only shell width was important. Andy.
10-12-15 | 06:43 AM
#10
Senior Member
Joined: Jun 2012
Posts: 854
Likes: 1
From: Central Ohio
Bikes: All 80s Schwinns: 88Prologue, 88Circuit, 88Ontare, 88KOM, 86SS, 88Tempo, 88V'ger, 80V'ger, 88LeTour, 82LTLuxeMixte, 87 Cimarron, 86H.Sierra, 92Paramount9c
Here is some previous discussion I found on this matter. Yeah the Gossamer should be compatible (I bolded that part)...
Check out https://www.bikeforums.net/road-cycli...ml#post8412886
Answer from FSA’s Dae Oh
The short answer; no, the FSA K-Force Light Rd. Crank is not compatible with a Chris King bottom bracket (made to Shimano compatible dimensions). Also, the K-Force Rd. crankset will not be compatible either.
The FSA BB8200 (meant for K-Force Light) uses a 6 mm width bearing. This allows us to make the bottom bracket outside to outside dimension more narrow providing room for a wave washer. The BB8000 (meant for K-Force) does indeed use a 7 mm width bearing, yet its design does not allow for use of a Chris King bottom bracket.
However our popular alloy cranksets, the Gossamer Rd. and the Energy Rd. is compatible with the Chris King bottom bracket (made to Shimano compatible dimensions). These cranks use BB6000, this BB's dimensions are compatible with Shimano.
Dae Oh
Full Speed Ahead
The short answer; no, the FSA K-Force Light Rd. Crank is not compatible with a Chris King bottom bracket (made to Shimano compatible dimensions). Also, the K-Force Rd. crankset will not be compatible either.
The FSA BB8200 (meant for K-Force Light) uses a 6 mm width bearing. This allows us to make the bottom bracket outside to outside dimension more narrow providing room for a wave washer. The BB8000 (meant for K-Force) does indeed use a 7 mm width bearing, yet its design does not allow for use of a Chris King bottom bracket.
However our popular alloy cranksets, the Gossamer Rd. and the Energy Rd. is compatible with the Chris King bottom bracket (made to Shimano compatible dimensions). These cranks use BB6000, this BB's dimensions are compatible with Shimano.
Dae Oh
Full Speed Ahead
Thread
Thread Starter
Forum
Replies
Last Post
swimbikerun
Tandem Cycling
0
02-23-16 11:55 PM
