Cranky questions

Hi all

Situation is I want/need to change the cranks on my kids MTB from 152, probably up to 165 now. It’s currently got square taper 104BCD cranks on there.

Anyone know of any decent easy and cost effective switch over options – seems like everything is 170/175!!

Or even if there is a square taper but different BCD, I could then pick up an alternate chainring etc.

Thanks for advice in advance.

I don’t have experience with any of these particular cranksets, but I’m not a small chap and have yet to break anything from Aliexpress (broke plenty of Shimano Cranks given enough time to wear through them with my heels mind)

The bing bang bosh, jobs a good un solution:

https://www.aliexpress.com/item/1005004252261873.html

The all in one 21st Century solution:

https://www.aliexpress.com/item/1005005866079643.html

The find your own BB and chainring solution:

https://www.aliexpress.com/item/1005005817449612.html

The damn, that’s pretty bling for a nipper solution:

https://www.aliexpress.com/item/1005006582746189.html

I got square taper ones from AliExpress for my lads bike. Seem fine. Ordinary black alloy cranks not dissimilar to the longer length basic Shimano Altus ones on my hack bike.

I’ve a pair of these and they’ve been great, obviously you’ll need a chainring but they’re cheap enough, just pick your speed and ensure they’re narrow/wide.

Jet BMX Square Taper Race Cranks

This is a rebadged version from Hup, who are a more premium kids bike brand.

HUP Kids Cranks: Children's Short Cranksets (104bcd 4-bolt) Narrow Q-Factor

Thanks so much, fantastic set of responses…

jivehoneyjive:
I don’t have experience with any of these particular cranksets, but I’m not a small chap and have yet to break anything from Aliexpress (broke plenty of Shimano Cranks given enough time to wear through them with my heels mind)

The bing bang bosh, jobs a good un solution:

Yep, think that will do the trick to me honest! I think he’ll be on this bike for another year and then I’ll change him to something more modern! Thanks v much.

slowol

I got square taper ones from AliExpress for my lads bike. Seem fine. Ordinary black alloy cranks not dissimilar to the longer length basic Shimano Altus ones on my hack bike.

Great, reassuring and helping me to make my decision, so thanks!

didnthurt
I’ve a pair of these and they’ve been great, obviously you’ll need a chainring but they’re cheap enough, just pick your speed and ensure they’re narrow/wide.

Jet BMX Square Taper Race Cranks

Thanks, I did see those, but they seem to be 160mm.  I went with the BikeDynamics and although a 160mm probably is better right now, he’s growing like a weed so would probably fit a 165mm by the end of next week!!

didnthurt
This is a rebadged version from Hup, who are a more premium kids bike brand.

HUP Kids Cranks: Children’s Short Cranksets (104bcd 4-bolt) Narrow Q-Factor

Thanks, but those don’t quite get up to the crank length that I’m looking for. Cheers though.