Originally Posted by
Jipe
It depends of what type of cassette you want to mount.
For a small wheel bike and without a bigger than usual chainring (60 or 65t that anyway isn't compatible with the new Birdy chain tensionner) a cassette with a smaller cog of 9t or 10t is needed (as mounted by R&M on the Birdy Touring).
The classic Shimano/SRAM freewheel body is limited to 11t as smallest cog.
R&M was using the now discontinued Shimano Capreo 9s system and is now using a Sunrace system (R&M use the 10s one, there is also a 11s)..
Another option that I have chosen is to use the SRAM XDR system.
Dropbox is not safe, can you post it somewhere else ?
For the Birdy disc front hub, there are indeed some options, also Hubsmith and Ridea but not easy to really buy.
This work for you ?
Front disc hubs if u want to buy a set yes it will be expensive.... Hubsmith , Ridea , Bzwheels all have hubs that will work on birdy disc.
However i would recommend getting the front hub and rear hub separately as it is easier to source the rear hub from your local wheel builder then it is to buy the entire set and ship it.
Besides u only need the front hub which u can get online easily and if need be the bearings can be changed to match the rear ones.
However if u insist on matching the hubs then it will be expensive I must.
If you choose to go with SRAM XDR system then Ridea and BZWheels are out for now.... That means u only left with hubsmith.
Alternatively get the front hub online and u can get a better rear hub to build the customs wheels at almost the same costs..
Just Saying