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 3.0 Deore XT M730. 1992 Marin Pine Mountain Deore DX M650.
Retro road: 1992 Eddy Merckx Corsa Extra Telekom Shimano 600 STI. 1993 Dyna Tech Ti.
Modern: 2006 Wilier scandium Ultegra 6600. 2014 Wilier GTR Ultegra 6800.