You didn’t think full-suspension XC bikes were only recently being raced at the top levels of the sport, did you? This month’s Throwback Thursday feature, a 1992 Manitou FS, is more than 20 years old, but it’s still in original condition – and offers a stunning snapshot of the early days of mountain bike full-sus technology.
The idea of a full-suspension mountain bike was still in its infancy back in the early 1990s but that didn’t stop Manitou founder Doug Bradbury from making one that could keep up with the best hardtails of its day. The simple design mimicked the basic profile of rigid frames but with reconfigured suspension fork legs in place of the usual seat stays, plus the requisite pivots behind the bottom bracket shell, above the dropouts, and up at the seat cluster.
The minimal travel, basic elastomer internals, primitive seals and simple pivot designs might not fly by modern standards but back then, it was not only state-of-the-art but an object of lust for mountain bikers worldwide. Even just a couple of inches of travel felt like a couch compared with fully rigid machines, and Bradbury managed to provide that with minimal weight penalty thanks in part to the then-revolutionary Easton Vari-Lite ProGram taper-butted aluminium tubing.
Though considered archaic today, the front and rear suspension on this manitou fs was considered state of the art 22 years ago:James Huang/Future Publishing
This particular example is no garage queen, either: it belongs to former pro – and current Trek mountain bike tester and brand ambassador – Travis Brown, who raced the Manitou FS during the 1992 season. The drivetrain is worn, there’s a patina of dust and grime, and like many FS frames, the head tube is cracked (in five places).
The simple pivot design used composite bushings and press-fit hollow steel axles. the bottom bracket is longer than what shimano would normally have specified for xtr in order to offset the chainrings to the driveside: the simple pivot design used composite bushings and press-fit hollow steel axles. the bottom bracket is longer than what shimano would normally have specified for xtr in order to offset the chainrings to the driveside
“I knew Doug through [fellow Trek employee] Scott Daubert, who was a friend and training partner of mine at the time and he was riding for Manitou,” says Brown. “After Worlds that year , we talked again and I thought that it’d be awesome to ride for a Colorado company. Being an independent frame builder, he didn’t really have the resources to go pro racing but it’s what he wanted to do. He finally got funding for a race team from his Japanese importer – which is where a lot of his bikes were being sold at the time – and eventually said, ‘I got a budget; let’s go racing!'”
Frame graphics were certainly a little simpler back then. in the case of this bare aluminium frame, it was just a matter of die-cut vinyl decals: frame graphics were certainly a little simpler back then. in the case of this bare aluminium frame, it was just a matter of die-cut vinyl decals
As it turns out, Brown’s career evaluating and developing mountain bike product started long before his days at Trek. Bradbury first provided a Manitou HT hardtail to try out for sizing, and said he could incorporate any changes he wanted into a custom design for his FS.
The underside of the stem is hollowed out to save weight: the underside of the stem is hollowed out to save weight
Brown indeed had some ideas, which included 50mm of additional top tube length relative to the stock geometry, paired with a short-for-its-day 120mm stem. Though Bradbury thought Brown was crazy at the time, the idea would ultimately work its way into the mainstream.
“It was very stable and that was something that I intentionally wanted so the bike would go straight when you were slobbering and tired.”
This one-off also incorporated an extra-wide rear end with a drivetrain that was pushed outboard by 10mm to create a zero-dish rear wheel – an impressively forward-thinking concept that would resurface roughly two decades later for the fat bike market. The design necessitated a custom Shimano XTR rear hub with 145mm spacing (which Bradbury made himself), special asymmetrical dropouts, and a longer bottom bracket spindle to keep everything properly aligned.
While the seatstays are symmetrically positioned relative to the frame’s centreline, the drivetrain was offset outward to yield a zero-dish rear wheel: while the seatstays are symmetrically positioned relative to the frame’s centreline, the drivetrain was offset outward to yield a zero-dish rear wheel
According to Brown, the zero-dish wheel and wider spacing yielded a noticeably stiffer rear end.
“It had a lot of stiffness for that reason. [Doug] had an intuitive design sense and was willing to try things. He was a super smart dude.”
Travis brown raced this custom manitou fs on the world cup circuit in 1992: travis brown raced this custom manitou fs on the world cup circuit in 1992
Special thanks to the folks at The Pro’s Closet, who will soon open up a museum of noteworthy vintage bikes at their headquarters in Boulder, Colorado.
Complete bike specifications
Frame: 1992 Manitou FS w/ custom geometry and 145mm OLD rear spacing
Fork: Manitou 2
Headset: Chris King, 1 1/4in threaded
Stem: Manitou custom, 120mm
Handlebars: Answer Hyperlite w/ Scott ATNZ-LF Short bar ends
Tape/grips: Answer Aggressor
Front brake: Shimano XTR BR-M900
Rear brake: Shimano XTR BR-M900 w/ Madison Aztec pads
Brake levers: Shimano XTR ST-M900
Front derailleur: Shimano XTR FD-M901
Rear derailleur: Shimano XTR RD-M900
Shift levers: Shimano XTR ST-M900
Cassette: Shimano XTR CS-M900, 12-32
Chain: Sachs Sedis
Crankset: Shimano XTR FC-M900, 175mm, 26/36/46T
Bottom bracket: Adjustable cartridge bearing
Front rim: Ritchey Vantage Comp, 28h
Rear rim: Ritchey Vantage Pro, 32h
Front hub: Bullseye
Rear hub: Shimano XTR FH-M900, custom 145mm OLD spacing