2011 Sram Red Double Crankset to compact - Rotor 3D+

[Milese]

Hi,

I've got a 2011 BMC Team Machine with a Sram Red 39/53 crankset and 11-26 cassette, which bluntly is too much for my ability and terrain (Cornish lanes and a week in the Alps coming up!).

So I want to put a compact on, and was thinking of either another Red or a Rotor 3D+.

I've seen various weights around. Can someone give me an answer on the likely weight difference between the two?

Also, the price on this looks a bit too good to be true, or am I missing something? Quotes 650g which must be with rings. The crank only quoted weight is 475g so does 175g for the rings seem reasonable?

http://www.jejamescycles.co.uk/rotor-3d ... 78674.html" onclick="window.open(this.href);return false;

I'll take my existing crankset off and weigh it if I get time later.

Thanks.

Please, there are many threads (and Madcow's crank reviews) if you search.