splines are still splines. that said my dirt cheap eclat cranks (whatever the first style ones are called) havent wobbled yet so maybe the larger spindle works better.
its pretty mad that so many companies keep trying to tweak the splined crank interface slightly to make them easier to install and remove when theres this magic stuff called "grease" which is easily available and already does just that.
its also real versatile, you can even use it on other parts of your bike which might get seized! imagine that...
So if you were designing splined cranks how would you set the fit?
Standard good engineering practice calls for a slight interference (hole smaller than axle) to prevent looseness and wear.
Easy assembly and disassembly calls for a slightly loose fit (hole larger than axle) to allow the axle to slide easily in and out.
You cannot have both and grease will only do so much to ease assembly and disassembly and of course on top of this you need to allow a tolerance....
Having said this, I am obviously not going to defend a design that saws slits into something as highly stressed as this where the slits nobviously massively reduce the torsional strength.
G.
PS nobviously was a typo but too good to "correct"
well for starters if i was designing cranks i wouldnt use splines. having to ensure a tight enough fit, yet still allowing enough movement to allow them to be removed is exactly why its a shit design. either they wobble all the time or theyre so tight you have to cut them off.
which is why i dont understand why people keep fannying about with this stupid design. yes it was good in the 80s when the alternatives were 1pc cranks or steel cranks with pinchbolts, but its still a design of convenience for profile cos they were making race car steering wheels with the same splined interface or something like that if i remember correctly.
i guess noone wants to spend money developing a different design that might work better (apart from you apparently), so its rehashed splines or rehashed shitter looking powerbite clones (which lots of people dont like anyway because of how they look). as with all bmx parts these days, unless youre patented up to the eyeballs, someone will just rip off your design that you invested in designing in the first place
only reason im riding splined cranks atm way cos they were so cheap. next time ill buy thunderbolts, dont you worry.
always primos before i got wombolts (which is what i had before my eclats), i just ground down the pedal insert too much to feel safe with them (they were first gen so olddddd) and the wedges were crushed and fucked so ironically they had a bit of wobble in them
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