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cranks, bmx and mtb.

Old 02-28-06, 12:20 AM
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cranks, bmx and mtb.

are bmx cranks really stronger than mtb cranks?

i need to buy new cranks in a couple months, so i'm just wondering why i see so many bikes at unrealcycles with profile bmx cranks instead of mtb cranks. is there an advantage?

i was just going to get some holzfellers, but read somewhere that bmx cranks are stronger, so just wanted to see what that was all about.
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Old 02-28-06, 12:24 AM
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They are stronger as far as I know, but they're also a lot heavier. Which is fine for a DJ/street bike, but for general purpose freeride with maybe a little XC, aluminum cranks and a good bottom bracket should be good enough.

Profiles are probably one of the most durable cranksets around, although one of the DH cranks with ISIS BB might come close.
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Old 02-28-06, 08:23 AM
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Profile makes BMX and mountain bike are you sure there the BMX version because profile does BMX racing and mtn biking.
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Old 02-28-06, 09:42 AM
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I'm not sold on bmx cranks, mainly because I tore through three bottom brackets in like 2 months. They were Euro style, so I guess American would hopefully be stronger. I ended up going with evolve dh cranks with the external bb. A bit heavy but, damn, I love them. So smooth. There's even a few mm chainline adj with the spacers.
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Old 02-28-06, 11:01 AM
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BMX cranks are mega-stronger; and heavy too. Most run a soild (or near-solid) BB spindle with a 48-spline BMX pattern. FSA makes one too. The crank arms are hollow chromoly and shaped like an aluminum arm and the BB is a solid 48-spline with three bearings (two on the drive side). But, really, it's overkill unless you're Bender...or weigh 250# and kill everything else. The Holzfeller's should do you fine, or look at the FSA Pounder.

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Old 02-28-06, 11:03 AM
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Signifigantly heavier. I have a set of profiles that are insanely heavy. I know they won't break, but holy crap they outweigh any other set I have.
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Old 02-28-06, 04:46 PM
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Definately stronger, and a bit heavier.

To put the weight in perspective, Profile cranks with a euro bb will add about a pound to your ride, that is if you had weenie-light cranks installed at first. Most people that freak out over the weight don't consider that the profile system includes the bb and spindle.

A set of euro bb profiles without the spider or rings weighs about 1100g.

A set of typical MTB crank arms with rings plus a BB weighs in about 900g.

Figure once you add a spider and rings to the profiles, it'll add a little under a pound to your bike.
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