I'm struggling to find 150mm or 155mm cranks with a 55mm or so chainline. Currently building new bikes for the mini a11ys and the 'Goldix' 150mm cranks they've used on previous HTs won't fit new FSers: chainring hitting the chainstay even with a 0mm offset 28t. I love my kids but not 'Hope-EVO-155mm-cranks' levels of love. Bikes are 12x148mm rear ends with 1x12 Shimano.
Bikes came with 165mm NX cranks (TBF shorter than I anticipated) but the kids are only 160cm and 163cm, so I'd prefer they had shorter than that. I've found some 160mm options but hardly seems worth it for 5mm reduction.
Can STWers recommend any 150mm or 155mm cranks that allow a 55mm or so chainline, on a relative (not Hope) budget?
For info, the 150mm Goldix with 28t chainring on previous bike which sadly don't fit the new ones:
These any good. Quote 521mm chain line with 3mm offset so you'd be close at 54mm with a 0mm offset ring.
Samox seem to do the majority of OEM high end kids bikes, but generally only available from AliExpress.
Have used HUP cranks on this setup before, no issues. Though like you prefer Goldix on the non-boost frames as price is mega!
Thanks folks.
I'd forgotten about HUP and Samox. Those Eagle 90s look to be a winner - I saw the e-bike version in this week's FGF but didn't realise there was normal versions. Should be a straight replacement for the NX 165s with DUB Wide BB that's currently fitted. I'd prefer Shimano but can't have everything.
I see several random brands on aliexpress but info is lacking re chainline.
Have used HUP cranks on this setup before, no issues. Though like you prefer Goldix on the non-boost frames as price is mega!
I somehow got away with the Goldix on a boost frame: photo in my OP is on their current Ragley Marleys and it works perfectly. Gutted when they hit the chainstay when trial fitting to their new Cannondale Habits.
Yeah, getting them into MTBing has it's downsides £££££.
I ended up with the Eagle 90's for my lad's bike aswell, seem pretty good so far and the ring works with any old chain (as your pic shows) not just the flat top Sram one it said it would.
It did have Goldix ones, but as he's got better/bigger/more brave he bent them at BPW 🙄
I ended up with the Eagle 90's for my lad's bike aswell, seem pretty good so far and the ring works with any old chain (as your pic shows) not just the flat top Sram one it said it would.
It did have Goldix ones, but as he's got better/bigger/more brave he bent them at BPW 🙄
Interestingly (or not...) about chains. Their new bikes came with SRAM drivetrain which I swapped in favour of a Deore/SLX cassette/mech/shifter. Tried the Shimano 12sp SLX chain which felt and sounded rough AF on that SRAM T-type chainring. Swapped to the 12sp NX chain the bike came with: smooth and silent.
I was admittedly a bit ignorant of T-type compatibility until now 😀
Glad to hear it worked.
FWIW the 140mm Goldix cranks arrived and they seem to fit on my BB86 bottom bracket without issues. Although from what Burchy1 says I might have to look at upgrading.
Just in case anyone finds this thread in the future, another option is Aerozine:
https://www.aerozinebike.com/products/crankset/kid-bike-crankset/
Together with their ultra-short stem I'm curious as to whether you can put kids on adult sized bikes from an even younger age:
https://www.aerozinebike.com/product/stem-control/xnc-10-stem-bundle/