[Closed] Very short cranks... Frog?

Cut them down. I’ve just cut a set of truvativ from 165 to 125. Made a massive difference.

I will not be cutting longer cranks down.

If I do that myself, it will be a catastrophe waiting to happen.

Thorn (SJS cycles) come in 150 and I think Isla Bikes used to sell parts?

https://kidsracing.co.uk/collections/short-cranksets-kids-cranks-lengths-narrow-q-factors/products/hup-kids-cranks-childrens-short-104bcd-narrow-q-factor?variant=15137739079743

These go down to 130. That was my second choice if the modifIcations didn’t work...

https://www.spacycles.co.uk/m8b0s109p3752/STRONGLIGHT-Impact-Kid-Cranks

Great suggestions!

Highpath Enigneering can do crank shortening. Though probably cheaper just to buy some new cranks.
https://highpath.co.uk/crank-shortening/

I put trailcraft cranks on my lads bike. Must of been feeling flush at the time 😂

Thing is, I live in Denmark so if I had to have something custom made it would be pretty expensive.

Those HUPs seems like a good shout!

+1 for thorns from SJS. Decent cranks at a reasonable price. Run a un55 bb and it will be bombproof for years.

HUPs here too, recommended.

If you do a search I matched up the shorter cranks Orbea use on their MX20 on Aliexpress pretty recently, that's another option. They're 5 arm 110bcd though so 35t minimum, 104bcd is better.

vpace use the same samox cranks as trailcraft. likely cheaper out of germany rather than the us too.

I used Trek Dialled cranks which have drillings for 120 and 140mm lengths, pretty cheap too.
https://www.tritoncycles.co.uk/components-c9/chainsets-cranks-c70/20-kids-cranks-p17701

https://www.paulmilnescycles.com/pmc-lasco-alloy-short-kids-crankset-cranks-110-bcd-5-bolt---black-5515-p.asp

Tune Hexagonal taper
https://www.ebay.co.uk/itm/Tune-Fast-Foot-Kinder-Kurbel-130mm-NOS-cranks-crank-for-Kids-MTB-BCD-110/113274220743?hash=item1a5fab70c7:g:KUIAAOSwZl1bxF3k

https://www.ebay.co.uk/itm/TORP-Tornado-Kids-lightweight-crank-arms-low-Q-Factor-145-152-mm/254534227224?hash=item3b436c1518:g:KQ4AAOSwe-ReWlpv

https://activesport.co/Hope-Kids-Crankset-No-Spider

https://www.bike-components.de/en/3min19sec/Kids-Crankset-p73160/

https://www.ebay.co.uk/itm/BOX-BMX-CRANKS-BOX-FIVE-SQUARE-TAPER-BMX-RACE-CRANKS/303606024679?hash=item46b05449e7:g:kaMAAOSwDFVe9QSq

https://www.ebay.co.uk/itm/Box-Bicycle-Cycle-Bike-Five-Square-Taper-Cranks-Black/274128895136?_trkparms=ispr%3D1&hash=item3fd35afca0:g:F1QAAOSwZgJe~UdG&enc=AQAFAAACYBaobrjLl8XobRIiIML1V4Imu%2Fn%2BzU5L90Z278x5ickkY3FSd4Ad8xn3oRtkVexxrI1IGVLFmM0mNtam7%2B2EBLJBzt%2FEkeJF6c1oNtcecjxd6LKvjgFTnx9T6G9lG1PFlIQRIETaUmyAs%2FjfeiyoJpI31SitMAR%2Bq2dsiA03ZJPSROBOWiBst7LAZsC687S4v9ebr6tCwIhiAy%2BODMvn13NY5kv%2Bm7wQOjGd25%2BWT%2BSjCFF7zC2UFM9ermZAatFhPxc8T8LFQvH4NzjCv3dv%2B6JvY8cS7UaLj14sO7vCgiKGr1rzuNqiTU1pkkQRmvY0L5FEIA3RVat5tq90fKf3dyrsiZZeH3vBF1cD1k9ihhau24WPyjIeT%2B3HeNyTZFapBRu3X8twtS15wqlppEyscaGnlfeWVB%2FFGIxvYQqYJxaECRnxuBuWFEozV6ckM1nVq%2Baj2LyfBgJZ9IKAsEK0n7ON3ldhNvmZlFJfr%2F5WLedCfDFWC2Ca%2F7AW9A3JPEy6uxW%2BDTZO2gR5rytJCsueRgURMUYOyCqNf%2F2GhxWviUerTa%2FNy7fWLI0ptxdFrL5TUv2s%2FjySrHpN3noQX5ewbpzAIXTt2ljVN1x1mBOHpRg1MmrglpsDFlVnhgxTYtir5cEmSSb2H%2FRuadiOKv58wK5w0pbpTUJuF49altJcKKJb5s32ynQz%2Fd1btpPmj44erz0xKU3UwhNOtyDvI2rYAAf2Y69c9%2F9tYcbT3KB3U2fSJ4F%2BJrB7IpAU4TWLU2GwDXBIvvcVSCAVWrE%2BipYYEfQ20jlD%2F1j8Fs%2FfjsBpXOEc&checksum=27412889513667a51acc6c9340ffb54b808c744fefd8

https://www.ebay.co.uk/itm/Box-Five-Square-Taper-Alloy-Mini-Junior-Expert-BMX-Race-Cranks-Black-130-170mm/264394842638?hash=item3d8f29220e:g:hNkAAOSw-2lex~4B

https://www.ebay.co.uk/itm/Redline-Microline-Crank-Arm-Set-Square-taper-110mm-B-C-D-Black/302114407430?hash=item46576c0406:g:BDwAAOSwx2dYCpm6

https://www.ebay.co.uk/itm/BMX-Mini-Cranks-with-bolt-on-spider-ANSWER-Alumilite-Mini-Cranks-135mm-White/223727241901?hash=item34172ecaad:g:828AAOSwgOJe6lTZ

Agree about the HUP cranks...going well for mine. Although, now on a new bike with 170mm cranks and annoyingly they don't appear to be too long!

Wow, those Dialed Cranks are cheap! Too bad they are sold out everywhere.

I'd rather not pay a small fortune if possible, so those HUP still tempt a lot.

Those Tune are cool too, shame that the 3 min 9 sec are so short.