We’ve had very good results with both the alloy and carbon Rolf wheels on our tandems. The carbon ones are very light, stiff, aero. Never had to touch or true them, we are about 290lb team and they became our go-to set of fast wheels. We just had a custom pair of Zipp 404 built to explore some TT options, so we may thin the herd and sell the carbon Rolf’s if they outperform them.