CVDs on XXX-CR - good idea?

[Graeme]

Hello all,

First post here and hoping you guys can help me out. Wondering about putting CVDs on a XXX CR. I notice there have been several versions over the years during the BK versions so my question is this.

1) Is fitting CVDs a good idea - everyone else seems to do it (X Factory, Associated etc)? I race mostly indoors on carpet with the occasional foray onto the dirt when the weather improves. What can I expect to gain or lose in the performance dept with CVDs

2) If it is a good idea which ones? BK or BK2 or TIR for BK2?

Cheers

Graeme