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Another bb / spindle problem

Old 10-15-19, 07:25 AM
  #1  
intransit1217
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Another bb / spindle problem

Going from a trekking triple deore with their “mountain” bb (that’s all it says on the part), to an FSA 46/30 megaexo crank and FSA bb 1000.

The bb 1000 seems to be a universal bb to handle both road or mountain bb sizes 68/73. I’ve tried all manner of spacer configurations but the crank clamps the bearing every time. After multiple tries, I’ve buggered the threads on the bb1000.

The bb1000 seems happiest with one spacer each side, but still doesn’t stop the clamping.

Wrong crankset?
Thanks for any help.
Buggered in Kenosha
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Old 10-15-19, 11:11 AM
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Originally Posted by intransit1217
Going from a trekking triple deore with their “mountain” bb (that’s all it says on the part), to an FSA 46/30 megaexo crank and FSA bb 1000.

The bb 1000 seems to be a universal bb to handle both road or mountain bb sizes 68/73. I’ve tried all manner of spacer configurations but the crank clamps the bearing every time. After multiple tries, I’ve buggered the threads on the bb1000.

The bb1000 seems happiest with one spacer each side, but still doesn’t stop the clamping.

Wrong crankset?
Thanks for any help.
Buggered in Kenosha
Is your BB shell 68 or 73? That, along with the presence or absence of an E type derailleur will determine how many spacers you need to install.
Did the bottom bracket ship with 3 spacers?
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Old 10-15-19, 01:09 PM
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Thank you, Dan. According to FSA, this bb is capable of either 68 or73 mm.
It did ship with 3 spacers.

I do not have a caliper, so actual shell number is unknown. Could it be more than 73? It’s a -17 masi Giramondo 27.5 version. The website has no spec on this area.

not going e-mech. Just manual shimano 105.
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Old 10-15-19, 01:29 PM
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Originally Posted by intransit1217
Thank you, Dan. According to FSA, this bb is capable of either 68 or73 mm.
It did ship with 3 spacers.

I do not have a caliper, so actual shell number is unknown. Could it be more than 73? It’s a -17 masi Giramondo 27.5 version. The website has no spec on this area.

not going e-mech. Just manual shimano 105.
It has been a long time since I installed one of those, but I seem to remember there are washers that go between the crank and the bearings, and they must be oriented the correct way so they push against the inner bearing race. Put em in backwards and you get the symptom you describe.
Anyhow, if the bottom bracket shell is 68mm and the front derailleur is not E type, it should take two spacers drive side and one non drive.
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Old 10-16-19, 10:14 AM
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For clarification, the “E type” refers to the ones that have a mounting bracket that is held on by the BB and so it acts as a spacer and changes the number of spacers required. Not a reference to electronic vs manual.
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Old 10-16-19, 12:04 PM
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Originally Posted by AeroGut
For clarification, the “E type” refers to the ones that have a mounting bracket that is held on by the BB and so it acts as a spacer and changes the number of spacers required. Not a reference to electronic vs manual.
Good to know! Thank you for the correction. Is “braze on” still acceptable for the front mech mount?
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Old 10-16-19, 12:11 PM
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Originally Posted by Dan Burkhart
It has been a long time since I installed one of those, but I seem to remember there are washers that go between the crank and the bearings, and they must be oriented the correct way so they push against the inner bearing race. Put em in backwards and you get the symptom you describe.
Anyhow, if the bottom bracket shell is 68mm and the front derailleur is not E type, it should take two spacers drive side and one non drive.
Thank you, Dan. I took it to my lbs that sold me the parts. Turns out, wrong bb part. Apparently it was a 68/73 specifically for mtb application. The crank is a “road” crank. According to my guy, FSA is a bit goofy on their bottom brackets, so extra checking is necessary. Anyway, part on order, they will install, and the crank, nc.

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Old 10-16-19, 05:50 PM
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25.4mm=1"
73mm=2.874 or 2-7/8",
68mm is "about" 3/16" less.

Is math that hard?
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Old 10-16-19, 08:26 PM
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If the bike has a mountain BB it has a 73 mm wide housing and does not need spacers between the bottom bracket and housing
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Old 10-17-19, 08:00 PM
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Originally Posted by wsteve464
If the bike has a mountain BB it has a 73 mm wide housing and does not need spacers between the bottom bracket and housing
In an industry with few absolutes, MTB bottom brackets are not an exception. There are lots of MTBs with 68 mm shells.
Outboard bearing type MTB bottom brackets are shipped with three spacers to work with everything from a 68 mm shell without an E type derailleur to a 73 mm with E type.
So a 73 mm without an E type still requires one spacer on the drive side.
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Old 10-17-19, 09:00 PM
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Originally Posted by wsteve464
If the bike has a mountain BB it has a 73 mm wide housing and does not need spacers between the bottom bracket and housing
Mine are all 68, but it's older stuff.
Ergo: WRONG

Just because YOU haven't seen it, doesn't mean it doesn't exist.
A problem that frequently occurs on this forum by too many of the younger "know it alls".
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Old 10-18-19, 08:40 AM
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Originally Posted by Bill Kapaun
Mine are all 68, but it's older stuff.
Ergo: WRONG

Just because YOU haven't seen it, doesn't mean it doesn't exist.
A problem that frequently occurs on this forum by too many of the younger "know it alls".
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