View Single Post
Old 10-22-18, 12:55 PM
  #22  
2_i 
Senior Member
 
Join Date: Sep 2005
Location: Michigan
Posts: 3,692

Bikes: Trek 730 (quad), 720 & 830, Bike Friday NWT, Brompton M36R & M6R, Dahon HAT060 & HT060, ...

Mentioned: 10 Post(s)
Tagged: 0 Thread(s)
Quoted: 834 Post(s)
Liked 332 Times in 247 Posts
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.
2_i is offline