They're not.I have had 2 T-Pros that the bottom bracket threads in the frame have stripped after a couple of months. Took the first back for a half price replacement, when the 2nd one went it was obvious it was a quality problem. So got and 'upgrade' to T-Mag frame, so overall we'd paid £500 and got a T-Mag without a disc! The back brakes wouldn't line up with the rim, down tube and bashplate so weak if you touch them they just dent/bend. The frame then broke, (cracked around bash mount), so I took it back for a half price replacement. When I got home the headset wouldn't fit in so I took it back and it had to be reemed. So they fitted it. So I went home. Then I couldn't get the BB in so I took it back again. and found that the threads hadn't been cut properly. So they fitted it. Then got home and I found the front bash screw hole hadn't been threaded at all I thought screw them, went to B & Q, got a die set and did it myself. The journey takes 45 mins from my house to Supercycles. All this shouldn't have really happened because when I broke my T-Mag I wanted a T-Pro instead. On the phone they said they had a frame for us to come and pick up. but when I got there they didn't have any WHAT A JOKE Reliable? YEA RIGHT P.S. I have had 4 Onza frames and 3 of them have broken. Plus they owe me £10 for the die set + money for petrol and about £1000 because I want all my money back for all the terrible Onza stuff I have bought from them over ther years. I might not have been all their fault that the threads and things hadn't been cut properly (if they are just an Importer) but the could have at least checked it. Sorry about the rant Don't think anyone else appart from Supercycles sells ZONA's ........... unlucky.