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Yeah, not sure myself, because the frame as a whole doesn't look like any of the others I've seen as it's got a straight top and downtube. However, the seatstays have got this, what looks like an 'RB' stamped into them so could well be initials for 'Rychtarski Bikes'? But again, nothing I've seen has this either, so could well just be wishful thinking!
Ended up not using the Shimano brakes as the front one didn't work on the bike.
Hi, are you sure the frame is a Rychtarski the rear stays look wrong to me. I have seen stays on the side of the seat clamp before but on track frames not road. I may well be wrong also the DA AX brakes came as long and short reach and can be a pain to fit.
Andy