REVIEW: 2010 trek 3900 disc & Bontrager LT-3, 26×2.0″

MSRP (new) $529.99

this bike is made for commuting I have it in size 18,and in orange

the geometry so, not good for Mtb, for me, but for people with short armed and short back, this is not a bad thing, but I am about 180 cm high and i am average sized  everywhere,so  I get a very upright position, But when I was a teen i was not as big as I am now so it was ok.

which is too small of mountain biking  but for commuting its OK, you will sit upright.

the bike is no real mountain bike, frame is way too short and the handlebar is too short too, this make the bike too responsive.

ignore the sticker that say trek mountain bikes, it just refers to the standard for mountain bike frames. it’s not a mountain bike,but it can be with some upgrades.

the frame can withstand mountain biking, but the geometry is horrible for mountain biking.


  • fork : the SR Suntour SF9 XCT V2, 100mm travel  does not have the promised 100mm travel, but more like 20mm, the fork had play and it got even more play so when i was braking hard i felt like the fork would snap or fall apart. lack of adjustablity.
  • ( I upgraded to RockShox Tora sl 2010 from my 6300)
  • Shifters/triggers: the stock are v brake lever and shifters, shifters are horrible you need to swing the lever way too long to change gear.
  • Brakes: the mechanical brakes don’t work well you need to press very hard to brake. these brake are so bad that V-brakes actually are better for braking wise,not wear wise of i upgraded  to hydraulic  & shifters/triggers,
  • Saddle– saddle is way too big for a fit guy like me, it wears out fast because of flex in the saddle the plastic under  it that  have screws in it will flex too so the screws will pop out.
  • tyres/tires:
  • The Bontrager LT-3, 26×2.0″ got horrible grip in the wet they are a death trap. on wet asphalt they slip and you will crash.
  • i upgraded to Bontrager XR1 Team Issue witch roll very well but have the necessary grip when you turn.
  • grips- best to upgrade to silicone og lock on grips
  • pedals – pedals made of plastic is silly,the will break if you crash into something,they wear out very fast, plus no grip, and in the wet they are useless and dangerous , I recommendd straightlines defacto pedals.
  • i have defacto’s on all my bikes.
  • Handlebar–  i out crown the handle bars but they should still be wider.
  • Saddle:  the plastic plate holding it in to the rails wear out fast.screw jump out.
  • Acera rear Rear derailleur: unpractical nut on the wire clamping,and its not as durable as the Deore an up wards.
  • the headset: the plastic cover does not help much, so dirt and water qill coem in and dirt water with grease will come out,so you have to re grease it often.25221077486_cf268d17c3

my upgraded 3900 :

winter ready & upgraded 2010 Trek 3900 Disc


waste of money, unless you need a bike fast and it’s the only bike you can then at the point you are i the store.

I only use the 3900 as winter bike,I will run 1×9 drive train, don’t need all the gears, plus the front dérailleur does not work in  below -2 degrees.