Steve, I've been using the Powertap Pro for a month now. It is similar to the SL, the only difference being the aluminum spindle and freehub body on the SL for weight savings.
If there's a problem with your system, you'll have to send it to Saris. And yes, there are wireless versions. In fact, in 2009, all Powertap hubs are wireless.
If you wanted to put the hub on a different rim, changing it would be the same as switching any hub to another rim. It's not different just because it's a powermeter (It's just like a regular hub).
But honestly, an SRM is a first wife's gift!!! Ciclosport HAC for the 4th wife!
stevechow said:i would like to know if it there is any problem. must i send to the shop for regular service. is there a not wireless version. also how difficult to fix it on another wheel.
great help, bro
Steve