1982 TS Isaac

This bike is not for sale. The bikes and parts we currently have for sale can be found on the MOMBAT for sale page.

Tim Isaac built his first bicycle frame in 1974 and continued producing frames under his own name until he joined Trek bicycle in 1979.  One special project was 8 TS Isaac frames destined for the 1980 USA Olympic team.  Although the USA team boycotted the 1980 Olympic Games, the bikes were ridden by the USA road team in events around the world. In the early 1980s, mountain bikes were becoming more popular and Trek began investigating the category.  Since Tim was the lead design engineer, and a frame builder, he built a couple of prototype mountain bikes to test out some designs. One bike went to Harry Spehar, the west coast Trek sales manager, while another went to Brad Thorne of Dia Compe USA (which later became Cane Creek Cycling Components).  These bikes were built to test out materials and designs for the upcoming 1983 Trek 850.  This bike uses similar construction to the stock Trek and many of the same parts.  Being a custom bike, there are a couple of custom touches.  Since Brad is tall, the bike has extra long 19" chainstays to help keep the front end on the ground while pedaling in the low gears.  The left chain stay also has provisions to carry a pair of extra spokes.  There are also a pair of Velcro straps to carry fishing gear.  The name Thorne is under the clear coat on the top tube and there is a BT stamped into the seat stay bridge.  The production Trek 850 is very similar to this bike and we now know where Trek went after this bike.  Tim later started match bicycles which built Isaac-designed Schwinn Paramount frames and Rivendell frames along side their own match branded frames. 

  Click on thumbnails below for larger images:        

Isaac  Isaac  Isaac
Isaac  Isaac Isaac
Isaac  Isaac  Isaac


Frame Cro-Moly, lugged
Fork Cro-Moly, cast fork crown
Rear Shock NA
Rims Araya 7X 26 x 1.75"
Hubs Suzue sealed cartridge
Spokes Stainless Steel
Tires Specialized Ground Control
Pedals MKS BM-10
Crank Sugino AT
Chain Sachs
Rear Cogs Suntour 5 speed freewheel
Bottom Bracket Sugino
Front Derailleur Suntour Mountech
Rear Derailleur Suntour Mountech
Shifters Suntour Power Shifters
Handlebars SR MTB 100
Stem SR MTS 100
Headset Tange Levin LTD
Brake set Dia Compe 980
Brake levers Dia Compe
Saddle Avocet Touring III
Seat Post Kalloy alloy fluted
Colors Green
Size 23"
Serial #   None

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"I’ve seen mountain bike rides transform people – not just their bodies but their way of thinking. Their spirit." Charlie Cunningham