Excuse me...I didn't fit it wrong...I've got engineering qualifications after my name thankyou very much...and won't be touching that place again with a barge pole!

PS: Would like to add I've done over 70'000 miles on bikes using DID X-ring rivited chains fitted by myself...only reason I fitted that crappy heavy duty one was waiting for new DID one to come in the post...biggest mistake I ever made never again!

As for BT014's...I get 3k out of one on my TLR...on 600 in theory should be seeing more than that...and depending how hard the bike is ridden on a TT600 that could be as much as 6k...but realisticaly if he's giving it beans then 3-4k

As for mixing sports rubber on the back and touring on the rear...that's just plain stupid...the front will be gripping more than the rear making the bike more unstable and less traceable...whatever you put on the front also put on the rear they are designed to grip with eachother based on their compersisitions.