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RADBMX.CO.UK  |  Technical & Reference Section  |  Tech and Restoration  |  28tpi bottom brackets
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Author Topic: 28tpi bottom brackets  (Read 1338 times)

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Offline McQUEEN

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28tpi bottom brackets
« on: February 12, 2017, 07:47 AM »
Is there a difference between a 28tpi bottom bracket set for a one piece crank and a 28tpi bb for a three piece crank?

I've a Tange CV-170 bb axle and only seem to find bb's at that thread pitch for one pieces?

Thanks in advance....
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It was all just cops and robbers.
And BMX.

Offline steve69

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Re: 28tpi bottom brackets
« Reply #1 on: February 12, 2017, 08:23 AM »
Yes, I believe the 3pc 28tpi bottom bracket diameter is smaller but I don't have conformation to hand right now.

(I'm in need of a 28tpi bb outer lock nut for a 1pc if anyone has one, would take a whole bb if I have to)
If there's air in the tyres... it's a rider

Offline kalex

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Re: 28tpi bottom brackets
« Reply #2 on: February 12, 2017, 08:40 AM »
Not sure if I'm on the same wavelength but I'm sure I've used a mongoose 28tpi opc bb on redline 401's double dimple spindle

Offline factory pilot

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Re: 28tpi bottom brackets
« Reply #3 on: February 12, 2017, 09:22 AM »
Not sure if I'm on the same wavelength but I'm sure I've used a mongoose 28tpi opc bb on redline 401's double dimple spindle

I've definitely heard of this being done ... It's a dilemma when using a 401 crank ... Techmatics are far too late ( 87/8 ) for most OS builds
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Offline steve69

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Re: 28tpi bottom brackets
« Reply #4 on: February 12, 2017, 09:24 AM »
Not sure if I'm on the same wavelength but I'm sure I've used a mongoose 28tpi opc bb on redline 401's double dimple spindle

Yes, the 401 bb is a regular 1pc bb. The Tange CV-170 that's spoken of I'm sure is a much narrower square drive unit
If there's air in the tyres... it's a rider

Offline kalex

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Re: 28tpi bottom brackets
« Reply #5 on: February 12, 2017, 09:33 AM »
Not sure if I'm on the same wavelength but I'm sure I've used a mongoose 28tpi opc bb on redline 401's double dimple spindle

Yes, the 401 bb is a regular 1pc bb. The Tange CV-170 that's spoken of I'm sure is a much narrower square drive unit

I did say I wasn't sure I was on the same wavelength  :D

Offline steve69

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Re: 28tpi bottom brackets
« Reply #6 on: February 12, 2017, 09:42 AM »
I just dropped a quick search to make sure I wasn't talking out of my backend. It would seem you need a 24tpi (not 28) but it does look smaller as I suggested.
If there's air in the tyres... it's a rider

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