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How low is too low on your BB height?

Jm_

sled dog's bollocks
Jan 14, 2002
20,059
10,623
AK
just a hair above 13.5" on my RFX with a 170 fork. 170 cranks. Not too low.
What fork? My debonaire thing sinks it a little bit and then there's the angleset.
 
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Gary

my pronouns are hag/gis
Aug 27, 2002
8,490
6,376
UK
most of you running 170mm cranks?
Nah
165s on 8 of my bikes only my Capra and BMX have 170s.
not actually running 165s for clearance but because my knees are fucked.

Capra will eventually get 165s when the original BB/drivetrain finally dies.
I don't ride BMX enough anymore for it to matter.
 

StiHacka

Compensating for something
Jan 4, 2013
21,560
12,508
In hell. Welcome!
most of you running 170mm cranks?
Nah
165s on 8 of my bikes only my Capra and BMX have 170s.
not actually running 165s for clearance but because my knees are fucked.

Capra will eventually get 165s when the original BB/drivetrain finally dies.
:stupid:
165mm on mah trail and DH bikes. 170 on the HT. The difference is not material enough for me to buy a new crankset but if I was to get a new one for the HT, it would be 165 also.
 

jstuhlman

bagpipe wanker
Dec 3, 2009
17,313
14,123
Cackalacka du Nord
What do you miss about it?
Hard to quantify. Purely subjectively, I felt like I got a bit more bang for the buck power/efficiency-wise. Slightly more leverage? Less "spinny"? I just about always run a 34 tooth ring up front. Dunno. Curious to hear other's thoughts and/or more scientifically-driven ideas.
 

Gary

my pronouns are hag/gis
Aug 27, 2002
8,490
6,376
UK
I think it's a mute point now most folk run massive cassettes TBH.

I run a 36T ring on all my mtbs. and no bigger than a 42t cassettes.

165mm cranks are definitely easier to spin (slightly) faster but that doesn't mean you have to, That's purely down to your gearing choice/gear selection.
 

ianjenn

Turbo Monkey
Sep 12, 2006
3,003
708
SLO
I think my EVO 29" is 12.75" in LOW. Then high is 13.3" it does make a decent amount of friends will rocks while climbing in LOW if you aren't paying attention. 12.5" is probably gonna be too low in many situations would be my guess....
 

Cerberus75

Monkey
Feb 18, 2017
520
194
I have short legs, so 165mm works better for my knees. Im ok on 170mm but I can spin up out of a corner faster and earlier with the 165mm.