24mm cranks

[blueee]

im looking into buying some 24mm fit indent cranks.
theyre on sale for cranks + sprocket for $150 and theyre overall about 2oz lighter than my twombolts.
but my main concern is that the they have been out for a while, no one is buying them and they will soon stop producing 24mm mid bb's
should i buy them anyways?

[joelite44]

im looking into buying some 24mm fit indent cranks.
theyre on sale for cranks + sprocket for $150 and theyre overall about 2oz lighter than my twombolts.
but my main concern is that the they have been out for a while, no one is buying them and they will soon stop producing 24mm mid bb's
should i buy them anyways?

People always say how the bearings don't last.

[Prodigal Son]

It seems like there is a lot of companies using them. Seems doubtful they would cease production.

[joelite44]

i see how 100 dollar cranks can be atractive. However you can clearly see how bearings on 19 mm cranks get murdered after a few years of use. Can't say the same about 24 mm cranks and smaller bearings.

[blueee]

I rode spanish 22's for 10+ years and only broke two bearings. I'm light on bearings

[weedbix]

You shouldn't be breaking them at all

150 bucks to save 2oz of non-rotating weight in the centre of mass of your bike... Save your money

Edit: Not to mention you won't have a concentric sprocket anymore, one of the underrated things Wom/Twom/Thunderbolts do

[andreas]

You shouldn't be breaking them at all

150 bucks to save 2oz of non-rotating weight in the centre of mass of your bike... Save your money

Edit: Not to mention you won't have a concentric sprocket anymore, one of the underrated things Wom/Twom/Thunderbolts do

What does the concentric sprocket thing mean, if you don't mind explaining?

[weedbix]

Concentric means perfectly centred. Wombolt family achieves this by having an interference (press) fit for the sprocket, instead of a slip fit

[blueee]

and what are the amazing advantages a concentric sprocket provides?

[weedbix]

Have a think about it when the mef wears off

[weedbix]

Teasing you in retaliation for being cheeky aside, I'll tell you what it does. It's nothing super amazing, and it doesn't even benefit me as I run my chain intentionally loose for crankflips and for a bit of extra time to start pedalling backwards in fakies

What it does is go a big way to minimizing tight spots in your drive train. Imagine running a slightly oval sprocket instead of a round one. Every 180' you are going to have a tight spot, and 90' from that a loose spot. Slip fit sprockets, particularly when paired with a slip fit hat washer (which isn't always the case) will make the sprocket sit a bit eccentric (off-centre), causing a similar effect (except every 360' instead of 180')

This is only really an issue if you tension your chain, but a lot of people in BMX do exactly that, particularly in racing to reduce wasted effort in pulling the chain taut before it actually moves the driver

In freestyle a lot of people wouldn't care or notice. But it is a clever bit of engineering that does have some effect. Wombolt family got a bit of a bad rep early on, but George did some clever things like this. Another clever thing was the spindle -> non drive side arm joint - it sets a proper preload (Edit: something very problematic with spline interface cranks like Profile) without having to rely on pinchbolts