Bottm Bracket Spindle Length?
08-14-12 | 05:17 AM
#1
Thread Starter
Zip tie Karen
Joined: Aug 2009
Posts: 7,005
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From: Fair Oaks Ranch, TX
Bikes: '13 Motobecane Fantom29 HT, '16 Motobecane Turino Pro Disc, '18 Velobuild VB-R-022, '21 Tsunami SNM-100
Bottm Bracket Spindle Length?
I have to install a SunTour Cyclone 7000 crankset:
https://www.velobase.com/ViewComponen...m=115&AbsPos=4
The listing doesn't say. I've tried thread searches. In Velobase, the SunTour cyclone bottom bracket sets are all 113mm. Is that the correct spindle length for this crank?
Thanks in advance for your collective wisdom.
Phil G.
https://www.velobase.com/ViewComponen...m=115&AbsPos=4
The listing doesn't say. I've tried thread searches. In Velobase, the SunTour cyclone bottom bracket sets are all 113mm. Is that the correct spindle length for this crank?
Thanks in advance for your collective wisdom.
Phil G.
Last edited by Phil_gretz; 08-14-12 at 06:29 AM. Reason: more direct link
08-14-12 | 09:05 AM
#2
Senior Member
Joined: Feb 2004
Posts: 30,225
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From: St Peters, Missouri
Bikes: Catrike 559 I own some others but they don't get ridden very much.
That's a JIS square taper - right?
One measurement is worth 1,000 assumptions. If it was my bike I'd test fit the crankset using whatever JIS bottom bracket that I had available. Then I'd measure how far inward or outward I needed to move the crankset and make that spindle length adjustment when ordering your bottom bracket.
One measurement is worth 1,000 assumptions. If it was my bike I'd test fit the crankset using whatever JIS bottom bracket that I had available. Then I'd measure how far inward or outward I needed to move the crankset and make that spindle length adjustment when ordering your bottom bracket.
08-14-12 | 09:25 AM
#3
Really Old Senior Member
Joined: Feb 2007
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From: Mid Willamette Valley, Orygun
Bikes: 87 RockHopper,2008 Specialized Globe. Both upgraded to 9 speeds. 2019 Giant Explore E+3
According to Sheldon, it's 110MM
https://sheldonbrown.com/harris/bottombrackets.html
"Not sure what size...."
https://sheldonbrown.com/harris/bottombrackets.html
"Not sure what size...."
08-14-12 | 09:35 AM
#4
Thread Starter
Zip tie Karen
Joined: Aug 2009
Posts: 7,005
Likes: 1,546
From: Fair Oaks Ranch, TX
Bikes: '13 Motobecane Fantom29 HT, '16 Motobecane Turino Pro Disc, '18 Velobuild VB-R-022, '21 Tsunami SNM-100
According to Sheldon, it's 110MM
https://sheldonbrown.com/harris/bottombrackets.html
"Not sure what size...."
https://sheldonbrown.com/harris/bottombrackets.html
"Not sure what size...."
08-14-12 | 09:46 AM
#5
Jack of all trades
Joined: Nov 2011
Posts: 2,003
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From: Spokane, WA
Bikes: Schwinn Peloton Ventana El Saltamontes Spec Stumpjumper Conversion Gravel
more like: https://sheldonbrown.com/bbsize.html
08-14-12 | 11:35 AM
#6
Senior Member
Joined: Jan 2012
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From: Trenton On
Bikes: 2010 Cannondale T1, 1998 Specialized FSR
Remember that the spec sheet assumes that the rear centerline is also 43.1mm. Is it? If you look up centerline on the Brown site you will find the method for calculating the rear centerline. If it is close to what the 110mm BB will give you then you are good to go. If not then you may need to change the BB length to give you the same chain line front and back. Al
08-14-12 | 12:06 PM
#7
Thread Starter
Zip tie Karen
Joined: Aug 2009
Posts: 7,005
Likes: 1,546
From: Fair Oaks Ranch, TX
Bikes: '13 Motobecane Fantom29 HT, '16 Motobecane Turino Pro Disc, '18 Velobuild VB-R-022, '21 Tsunami SNM-100
It's a 6-speed freewheel on a 126 OD hub, so I'll measure to between the 3rd and 4th position. I can also mount onto the current spindle, which is a Sugino AS road crank.
08-14-12 | 12:40 PM
#8
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From: CID
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)
I'd use something short.
Potentially-irrelevant example: I'm using a 107mm bottom bracket with a Sugino triple crank on an old Bianchi with a 70mm bottom bracket shell and 126mm rear spacing. It's set up as a double, using only the two biggest rings, and the chainline is still a couple mm outboard of being centered with the 6-speed freewheel.
My point? If the BB shell were 68mm, and I were using a double crank, I imagine the crankset would be perfectly centered with the FW, and that's using the shortest BB I can get from Shimano. You don't want to know how badly-aligned it was with the 123mm BB spindle that came with the bike.
Potentially-irrelevant example: I'm using a 107mm bottom bracket with a Sugino triple crank on an old Bianchi with a 70mm bottom bracket shell and 126mm rear spacing. It's set up as a double, using only the two biggest rings, and the chainline is still a couple mm outboard of being centered with the 6-speed freewheel.
My point? If the BB shell were 68mm, and I were using a double crank, I imagine the crankset would be perfectly centered with the FW, and that's using the shortest BB I can get from Shimano. You don't want to know how badly-aligned it was with the 123mm BB spindle that came with the bike.
