I have a nice MT5 that with the help of some On-one midge bars has now become my cross bike / road winter trainer / commuter. Very comfortable frame.
Was the MT5 the successor to the MT4 or a model above / below?
I would still love to add a pair of those X-lite-designed double crown fixed forks that appeared on a few titanium dynatechs in the early 90s. They go for a fotune on ebay tho
MT5 was a metal matrix main triangle, otherwise same as an MT4. Many stories fly around, officially the team bikes were MT5 but I know that Paul Hinton rode the odd MT4 frame, some stories even claim that David Baker rode an MT3 as he prefered the steel rear end...
So to answer your question, MT3 Steel rear end, Ti Main tubes. MT4 Ti main tubes and chain stays. MT5 MMC main tubes and Ti chain stays. All were sold concurrently.
Somerset, like 'Heartbeat' with newer cars!
Retro MTB: 1992 Cannondale M1000 Deore XT M730. 1992 Raleigh Dyna Tech Quantum Deore XT.
Retro Road: 1992 Eddy Merckx Corsa Extra Telekom Shimano 6500 Ultegra. 1993 Dyna Tech Ti Campagnolo Athena 8 Ergopower.
Modern: 2004 Wilier scandium Ultegra 6800. 2014 Wilier GTR Dura Ace 9000.