Shimano Hub Dynamo and Roller Brakes

[leafytrees]

Hi,
Long time lurker but hoping for some help. I have a Danish bike (not Dutch!) with hub gears (Shimano Nexus 7 Speed) and roller brakes. I'd like to get a hub dynamo which looks like it might involve buying a new wheel. My front roller brake is an IM50 and according to this table:
http://www.birota.ru/manuals/shimano/allinone/RBA0B_EN.PDF
I need a HB-NX50 or HB-NX60 hub dynamo. Unfortunately I can't seem to find these. I can find a DH-3R40 which usually fits to the IM70. Does anyone understand Shimano designations sufficiently to tell me whether it's a problem to use a 3R40 with an IM50?

Just to note, the front hub incorporates a power modulator. I know these get a bad press, but my brakes are fantastic and work very well. I commute up and down a reasonable hill (well I think it's a reasonable hill) and I also take my daughter on a trailer bike and I've never struggled to stop.

Thanks very much
Katie

 

[alicat]

Not sure but you could post on the CTC forum where Brucey is very knowledgeable about things like that.

Alternatively SJS Cycles have the front roller brake at ... gulp....£49.99 here.

I agree with you about the Shimano roller brakes. My Giant Expression N3 now converted to N7 has them and they are great.

 

[mickle]

All shi**no roller brakes are inter compatible, there's only one standard (though fronts differ from rears). Buy a roller brake splined dynamo hub and your current brake will fit.