Originally Posted by
Winfried
Thanks for the info.
Because I don't have the tech skills to do it, and the retailer from which I bought told me it was either expensive or right-down impossible to modify the World Sport to add more speeds. Considering the price of the World Touring Disc, I'll pass and buy a Dahon/Tern instead.
But out of curiosity, what parts are certified to be compatible with the World Sport, ie. it wouldn't take more than a couple of hours of work for someone qualified to make the change?
http://en.r-m.de/bike/world-birdy-sport/
I'd like a bit more speed than the current 56x11 when riding on flat roads, and more speeds when going uphill than the current 56x30.
The Shimano CS-HG40 is crap anyway: Even though the new cassette only has 500km's and I always start in 3rd gear (6 on the shifter) to go soft on it (and my knees), the first cog (11) is already "ripping" (don't know the right word: Feels like missing some teeth while cycling.)
Edit: BTW, is this the dual drive mentioned above?
http://www.bike-advisor.com/reviews/...e-27-2011.html
That's the system. You don't need the whole system, just the hub and a 3 speed shifter for the IHG. You don't need to change your cassette, or your rear mech, or your shifter. You also need the click box for around £12, and a 3 speed shifter and cable.
Birdie used to produce a dual drive version, but they struggled getting enough hubs I believe.
Its all compactable with shimano shifters and any shimano sis kit.
You just need to use the same number of speeds. Ie and 8 speed will index with an 8.
The 3X8, will also take a nine speed cassete ifaik.
Any good bike shop should be able to build up a dual drive set up on your birdie. I have done 3 dual drive conversions. I got a
Get a used hub for less than £100 with luck on ebay.
+ click box £12+ wheel build£45 + rim 30 + shifter and cables £20.
£207 Total.
But.....
maybe as low as 100-150 if cheaper hub and/or sale of old wheel or reuse old rim spokes and sell old hub.
They make a disc version also. See the dualdrive on a mezzo thread or upgrading a mezzo.
Most dualdrive users love the system ime. The ihg shifts slickly under load and is miles better than a front mech that it takes the role of.
I might do it to my birdie, but mine needs some some general tlc first!!