Originally Posted by
fietsbob
here is a Triple internally geared crank
Efneo GTRO a 28t physical chainring
attached to the gear box, So, has 2 internal overdrive gears,
as if it has a 40 and 50t chainring,
but the chain is still on the 1 chainring, it turns faster than the crank-arms in 2nd & 3rd..
a lever shifts the gears with a cable , no FD at all ..
For a fast shift at any speed..
Thanks, it principally looks good, but then for Brompton they say that it is 37T ring. I am not sure where the latter limitation comes from and without correspondence with them it might be difficult to figure that out. Is it a challenge to BWR and then 24T in triple is bad too?? Fortunately I am on the lower side of Gaussian curve and maybe exert weaker forces. One review says that GTRO's net weight comes up to 1.6kg.