My Clockwork wheel came with a 130mm rear axle and I had no problems despite the 135mm spacing on the frame.The same wheels were put on my first Cannondale project and caused much grief.Basically the chainstays did not bend,the rear drop out did,twisting inwards and causing gear shift problems as the rear mech was not vertical,so depends on frame.Changing to a wheelset with 135mm axle solved the problem.
For my latest Cannondale project I bought a 135mm axle and made the change.On the first run through I put the spacers equally on both sides,however the cassette was then too near the fat stays.On the second attempt I put a large spacer on the cassette side and a small spacer on the other side.The cassette was in the right position but the wheel was no longer central in the frame.I had the wheel re-dished for £8 down my LBS and everything is now perfect.