Hi Billiboi I have an Onza T-Mag and i run my chain tugs on the inside of the frame if you get me and i haven't had a problem with them the chain may get abit slack after a while but just tighten up the chain tugs abit and they be fine again thats how i have mine anyway but I'm getting snail cams tomorrow heard they were better plus my new wheel only takes snail cams so wont be using tugs for much longer hope this helped Kieran.