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As above, looking for some 60BCD chainrings.
They're for Mrs DP74's [URL= https://singletrackmag.com/forum/topic/new-trike-day/ ] Mountain Trike[/URL].
She's had a couple of outings on it and it's a bit under geared.
Looking to put slightly larger chainrings on the front to speed it up a bit.
Been and measured the BCD and it's 60mm.
Waiting for a reply from Mountain Trike to see what sizes they do, but thought I might be able to get them somewhere else - any suggestions?
Not aware of anything that is 60 BCD. Could it be 58mm?
Yeah could well be 58.
What size are you after? Can't find anything bigger than 24t in 58bcd...
Think they're both 22tfront & back.
Could try a 24 on the front and may be drop the back one down too.
Will get the chain off properly tomorrow and confirm teeth.
The other thing I was thinking was seeing if I could get an adapter made to go from 56 to 76 - would give a bigger range then. Will need to measure and see if it can be done.
Heard back from Mountain Trike and it's a 58 BCD 4 bolt ring.
Max recommended size is 26t.
Anyone know where I can get some from?
Can find 5 bolt but not 4 bolt.
Betd / Royce / Renthal might (?) be able to make you something.
There are some solid bmx rings that could be drilled with the 4 bolt pattern. Might also need a flick in a lathe to open out the centre hole and reduce tooth thickness (most are for 1/8" chains).
What is it like for tensioning the chains? For info a total change of 4 teeth = add or remove approx 1 full link. 2 teeth can be accommodated with a half link.
Maybe tap-up Martyn Ashton, see what he's running and where he gets them from?
Send me a PM if you want, we can make custom chainrings.
Thanks all.
Mountain Trike can supply them with the additional chain links for less than I expected.
Chain tension I'd done with a spring loaded tensioner.
Thanks @kayla1 will see how this goes and might look at changing the back ones later so will keep it in mind.
No probs 😀
edit- why don't the damn smileys work on here?
Middleburn did 58bcd rings as well so if you ever need any more please email me at paul@betd.co.uk and I will help you out.