<div column 50% #intro>
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===== Koski Overview =====
After building up many klunkers from his family's [[https://mmbhof.org/the-koski-familys-cove-bike-shop/|Cove Bike Shop]] in Tiburon, CA, and then helping his brother Don Koski and Mert Lawwill launch the [[lawwill:start|Lawwill-Knight Pro-Cruiser]] in 1979, Erik Koski launched the Trailmaster on his own. Only 55 to perhaps 75 were produced over three years ((see production notes)). Koski resurrected the brand in 1998 to co-produce a Titanium version with Steve Potts (([[https://www.mtb-kataloge.de/Bikekataloge/PDF/Mountain_Transport/Moutain_Transport.pdf|Mountain Transport Catalog]])).  See also: [[https://mmbhof.org/erik-koski/|mmbhof]] and [[http://mombatbicycles.com/MOMBAT/BikeHistoryPages/Koski.html|mombat]].
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<div column 45%>
{{koski.jpg?300|koski}}
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Erik Koski 1988 [[http://mombatbicycles.com/MOMBAT/BikeHistoryPages/Koski.html|mombat]]
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<div column 50% #s1980>
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===== 1980 Trailmaster =====
Designed by Erik Koski and built by [[https://mmbhof.org/dave-garoutte/|Dave Garoutte]]. See also: [[http://www.dkg-cnc.com/museum.html|DKG Museum]].
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<div column 45%>
{{tm.jpg?300|1980 Koski Trailmaster}}
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1980 Koski Trailmaster #2 [[https://www.sfomuseum.org/exhibitions/repack-rwanda-origins-evolution-and-global-reach-mountain-bike/|SFO museum]]
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<div column 50% #s1982>
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===== 1982 Trailmaster =====

Offered for sale 27 Dec, 2021 for $8,000.00 @ [[https://www.facebook.com/photo/?fbid=10227557410506681&set=gm.10159755395677463|facebook]]
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Atom drum brakes?
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<div column 45%>
{{1982.jpg?300|1982 Trailmaster}}
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1982 Trailmaster  [[https://www.facebook.com/photo/?fbid=10227557410506681&set=gm.10159755395677463|facebook]]
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<div column 50% #s1984>
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===== 1984 Trailmaster =====

"#51/53 built".  Converted to single speed.  Originally with a 2x7 SunTour drivetrain.  SunTour roller cams, [[https://www.paragonmachineworks.com/dropouts.html|PMW]] dropouts.


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<div column 45%>
{{1984.jpg?300|1984 Koski Trailmaster}}
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1984 Koski Trailmaster #51 [[https://www.facebook.com/paragonmachineworks/posts/pfbid02kmqWcVvuZJd2oo5EXFUV7EkZYfaZ47fa6JZjHmHzwSeeUxrF2KCD2Uu4GcgZYAkhl|facebook]]
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<div column 50% #more>
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===== One more pic =====
Not enough credit is given to Erik Koski in the history books. Joe Breeze used Koski forks for the first set of Breezers. The Cove Bike shop printed the very first mountain bike catalog in 1980. Koski mountain bike components were sold for decades.

This photo comes from [[https://friendsofchinacamp.org/|China Camp State Park]] were mtbtimeline personally used to ride off road in the 1980's each weekend - never once seeing another bicycle - probably because all the action was next door at Mt. Tam...

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<div column 45%>
{{trailmasters.jpg?300|trailmasters}}
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2014 group ride in China Camp, Marin [[https://blackmtncycles.com/well-hello-there/dsc01378/|blackmtncycles]]
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==== Production Notes ====
<WRAP #prod1 />
[1].  As Trailmaster #2 was 1980, 1980 is a good guess as the start date. See: [[https://www.sfomuseum.org/exhibitions/repack-rwanda-origins-evolution-and-global-reach-mountain-bike/detail#4|SFO Museum]]
<WRAP #prod2 />
[2]. Less than 100 Trailmasters ever built. [[http://fattireflyer.com/|Fat Tire Flyer]], page 117.
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  * Or perhaps only 55? [[https://www.mtbr.com/threads/30-years-riding-the-same-mountain-bike.642880/|mtbr.com]]
<WRAP #prod3 />
[3]. End of production in 1982? [[http://mombatbicycles.com/MOMBAT/BikeHistoryPages/Koski.html|Mombat Koski Catalog ]]