Trek 3900 XC Hardtail

3.74/5 (46 Reviews)
MSRP : $340.00


Product Description

  • Alloy front
  • Rear Derailleur
  • Matrix 550 rims
  • Alpha Aluminum
  • Front Suspension


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Reviews 1 - 15 (46 Reviews Total) | Next 15

User Reviews

Overall Rating:3
Value Rating:5
Submitted by Sergio Renteria

Date Reviewed: August 2, 2012

Strengths:    Awesome frame

Weaknesses:    Cheap compoments, all bikes should've came with disc brakes. The saddle, and peddals.

Bottom Line:   
Great bike for the price. Haven't really done any hard riding, but overall it feels great. I got the one with V type brakes and made the disc conversion myself and it was fairly easy. I replaced the wheels with lighter disc type wheels, replaced the crankset, pedals, front and rear dérailleurs, shifters, brake levers, grips, and saddle. All I need now is a new fork.

Overall Rating:3
Value Rating:4
Submitted by Allrotor13b a All Mountain Rider from La Mesa, CA

Date Reviewed: March 24, 2012

Strengths:    For under $500, you get yourself a lifetime-warranted frame! The newest version has a zero-stack headset, pretty decent components, and disc brakes. The factory components are ok, if you do not ride too much trail or gravity. The bike is upgradable.

Weaknesses:    Wheels and fork are absolutely rubbish, but that is true across the board at this price.

Bottom Line:   
Nice bike to get you rolling, which you can upgrade as you go.
The geometry is friendly and is middle-of-the-road enough to accommodate any riding style.

Expand full review >>

Favorite Trail:   Whichever one i am on at the time

Duration Product Used:   More than 3 years

Price Paid:    $360.00

Purchased At:   TREK La Mesa

Similar Products Used:   Diamondback, Gary Fisher, etc.

Bike Setup:   Now:
Marzocchi MX PRO 100mm fork
Answer Rove FR pedals
Shimano SLX 665 2x9 cranks
Hope bottom bracket
Shimano Saint 11-28 cassette
Shimano XT chain
Shimano XT front derailleur
Shimano XT shadow GS rear derailleur
Shimano XT shifters
Shimano XT brakes
Mavic DeeTraks wheels
Kenda Nevegal 2.35 front/Small Block 8 2.1 rear
Bontrager XXX-LITE 80mm stem
Hope headset
Bontrager X-LITE 660mm riser bar
Oury lock-on grips
Bontrager SSR seatpost
Bontrager Earl saddle

Overall Rating:4
Value Rating:4
Submitted by Blaize a Cross Country Rider from Southportm NC

Date Reviewed: December 28, 2011

Strengths:    Price... Even new, the price is pretty good for a mountain bike of reputable quality. It's also upgradable. The bike is built like a tank. I've been ragging on mine for several years now and have done some pretty intense riding with it, and it is still holding together with the original components.

Weaknesses:    Weight... this is largely due to the front fork and rims. I have upgraded the rims to something lighter and replaced the pedals with shoes... I'll probably upgrade the fork to something lighter in the near future.

Bottom Line:   
A solid bike for a beginner/amateur with plenty of room to grow.

Expand full review >>

Favorite Trail:   Tsali

Duration Product Used:   More than 3 years

Price Paid:    $250.00

Purchased At:   Second Hand from Fri

Similar Products Used:   Gary Fisher Marlin

Bike Setup:   Stock frame, fork, and components.

Shimano M087 shoes, lighter rims, XC Tires...

Overall Rating:2
Value Rating:2
Submitted by joel a Cross Country Rider from HudsonBay Saskatchewan Canada

Date Reviewed: August 15, 2011

Strengths:    everything but the tires and shifting

Weaknesses:    Tire rims, gear shifting

Bottom Line:   
This bike is good on the highway. Other than that it is not related for trails. Did a little 180 spin and bent the rim on the bike and i havent even had it for a month sadly. I recommend this bike just for highways. The bike shifts ok it sometimes does skip but doesn't do it to often.

Expand full review >>

Duration Product Used:   Less than 1 month

Price Paid:    $470.00

Purchased At:   wheaton bikes

Similar Products Used:   na

Bike Setup:   na

Overall Rating:2
Value Rating:3
Submitted by AWDfreak a Weekend Warrior from SF Bay Area, CA (USA)

Date Reviewed: June 24, 2011

Strengths:    The frame stays in one piece

Weaknesses:    Everything else

Bottom Line:   
If you want to get serious about mountain biking, avoid the 3-series at all costs. A 4300 is more suitable if you want to get into mountain biking.


Otherwise, the best a 3-series such as the 3900 will be good for is the occasional light trail use, but mostly paved bike path use.

For those who simply ride casually once in a while. I'm ashamed to call it a mountain bike with the components it has. Most ambitious and adventurous kids will outgrow this bike quickly.

Expand full review >>

Duration Product Used:   More than 3 years

Similar Products Used:   crappy Chinese bikes from department stores


Overall Rating:5
Value Rating:5
Submitted by CHANCE B a Weekend Warrior from Texas

Date Reviewed: December 1, 2010

Strengths:    Frame, disc brakes, shifters

Weaknesses:    Handle bars, fork, pedals, rear derailleur

Bottom Line:   
This is a great entry level bike. I have flat out abused this bike for 3 weeks now and have only had to replace the bars. It does have week components, but I didnt purchase the bike expecting it to perform on the same level as a thousand dollar bike. I bought it to get me started, and I plan on upgrading to better components as the factory ones wear out. All in all you cant ask for much more for the money.

Expand full review >>

Favorite Trail:   Ft Rucker

Duration Product Used:   Less than 1 month

Price Paid:    $450.00

Purchased At:   Dothan Cycle and Fit

Bike Setup:   Stock

Overall Rating:3
Value Rating:5
Submitted by Robbio7 a Weekend Warrior from Kalamazoo, MI, USA

Date Reviewed: September 27, 2010

Strengths:    Strong Frame, Smooth, Cheap, Upgradeable platform.

Weaknesses:    Handle Bars, Stem, Grips are terrible. Rear Derailleur. Seat post slides down a lot.


Bottom Line:   
I have had this bike for 5 years now, I have been riding it abusively as a trail rider for 2 years now. This thing is a battle tank. I did a good bit of modification to it because i can. I love this bike and the only reason for not using it anymore is i am riding a 29er now. This is a great bike for a beginner and will last through some abuse. I am 5'10" and 180 lbs, but the bike would fit someone 6'0" like a glove. I highly recommend new grips and a lighter and shorter replacement for both the stem and handlebar.

Expand full review >>

Favorite Trail:   Ft. Custer

Duration Product Used:   More than 3 years

Price Paid:    $400.00

Purchased At:   Assenmacher, Swartz

Bike Setup:   Stock Frame, Brakes, Derailleurs. New shifters, grips, stem, handle bar, Wheelset, tires,

Overall Rating:3
Value Rating:4
Submitted by Matt a Cross Country Rider from Lincoln, NE, USA

Date Reviewed: August 28, 2010

Strengths:    The Al frame.

Weaknesses:    Components, weak fork.

Bottom Line:   
I've been riding my road bike primarily for the last few years and a friend I ride with started to get into single track. I had hoped to find a cheap, decent bike with a broken fork or some other damage that i could fix easily. As it turned out, someone traded this bike to my brother for some work he did. He cannibalized the front wheel, handlebar, tires, and seat. I told him my plan and he gave what was left to me.

I was lucky enough to have an old front wheel from my 820 that I used as a stop-gap, found a used 620mm straight bar for 15 bucks, NOS (2009) BB7s for 44 dollars, a Deore RD-M770 for 60, and someone who would trade my wheels for a set of disc wheels that were on a non-disc bike that he was giving away. So, so far, this bike has cost virtually nothing for the quality that I'm left with. I plan on sinking a fair amount of money into a model year or two NOS fork of some kind very soon and it should be about perfect for what I want to do with it.

So that is a major advantage of this bike. If it can be had for very little money, it can be upgraded fairly easily! The stock rear derailleur is a crappy acera; when I had it off road the chain would slap like crazy and I even had it leap gears. since the frame can accept disc brakes, I replaced the cheap, cheap V brakes and it stops like a champ now. The front fork is also very weak on the 2007 model that I have (Spinner Grinder 1... I can't even find documentation for this POS) and it bottoms out on virtually anything I do (keep in mind that I have a road bike that i use for just about any road-like riding).

Now it shifts and stops like a dream and after I get a fork it should be ideal for anything but racing (it is not a very light bike). It's already been a blast for single track.

So, would I recommend it? If you have the money for something better, get it. But if you don't get this and upgrade as you go! If you can get one for free (or very nearly) grab it up and take advantage of the frame. In short, I recommend it, but my recommendation is heavily qualified.

Expand full review >>

Favorite Trail:   Dirt Ones

Duration Product Used:   3 months

Purchased At:   Given to me

Similar Products Used:   Trek 820, Y33

Bike Setup:   Avid BB7s, Shimano Deore RD M770 (Rapid Rise), Shimano 525 hubs, Mavic X221 rims

Overall Rating:4
Value Rating:4
Submitted by Shredder a Cross Country Rider from Paranaque City, Philippines

Date Reviewed: June 22, 2010

Strengths:    A good solid bike. If you like hitting the trails a lot but don't really have the budget, this is the bike for you. The fork is good for light trails but it tends to bottom out when the trail gets nasty. The tires are pretty good for both the road and dirt. The bike was actually designed pretty well and most of the components on the bike will definitely do if you are not looking for top performance. If you want to bring out the bike's potential, you might want to consider shelling out an additional $200 or so for upgrade parts.

Weaknesses:    It's a little heavy for a hardtail. I have a full suspension bike that is a little lighter than this. That says a lot considering hardtails are supposed to be lighter. I have the white version of this bike and dirt sticks to it like anything but that's the price I get for getting anything white, right? Stock brakes are pretty bad so you might want to replace them with at least entry level Shimano brake calipers and discs like the Non-Series BR-M416. That will definitely help with the braking.

Bottom Line:   
It's a pretty good bike. The stock shifters did a pretty good job until I decided to upgrade. The stock brakes are pretty bad. poor stopping power and I constantly had to adjust the setup. I think I would have been better off with rim brakes considering how bad the Promax disc brakes were. I decided to replace the braking system with an entry level hydraulic system from Shimano. That made all the difference. Braking power is fantastic and modulation is all there. Next project is to lighten up my front end by replacing the stock handlebar and stem to carbon fiber parts and perhaps replace the stock suntour front suspension to something with hydraulics. Bottom line is that if you want to get a good bike on a budget, this is the one for you. Shell out and additional $200 for upgrades and I can guarantee that you will be a very happy camper.

Expand full review >>

Favorite Trail:   Anywhere and Everywhere

Duration Product Used:   3 months

Price Paid:    $350.00

Purchased At:   LBS

Similar Products Used:   Mongoose, Cannondale, Merida and Giant entry level bikes.

Bike Setup:   Stock except for new Ashima Airotors, Deore shifters, Deore hydraulic brakes, Viper pedals and bar-ends for climbing steep hills.

Overall Rating:4
Value Rating:4
Submitted by pletang a Cross Country Rider from Gatineau, QC, Canada

Date Reviewed: June 10, 2010

Strengths:    Lighter then my old Norco hardtail.

Weaknesses:    Fork is crap and heavy.The fork did not last the 2009 riding season.
Plastic pedals.
Soft rubber grips.
Tires are not for trail riding, Bontrager LT3.


Bottom Line:   
I have 21", I am 6.3 215lbs. I love this bike it is light and fast and it did not cost two grand. Basic equipement on the bike is easy to maintain.

Expand full review >>

Duration Product Used:   1 Year

Price Paid:    $500.00

Purchased At:   Polo Velo

Bike Setup:   Sr Suntour Epicon SF9 RLD.
SUNLINE lock-on grips thick
Metal pedal with toe straps
Bontrager Big Kahuna or Kenda Kinetics.

Overall Rating:5
Value Rating:4
Submitted by Brandon a Racer from NSW, Australia

Date Reviewed: May 18, 2010

Strengths:    My bike has many modifications on it. it rides on Nitrogen filled tyres, has a cushioning gel seat and is super light weight.

Weaknesses:    none

Bottom Line:   
Best bike in the world

Expand full review >>

Duration Product Used:   6 months

Price Paid:    $900.00

Purchased At:   Clarence st Cyclery


Overall Rating:4
Value Rating:5
Submitted by DVSKOPE a Downhiller from APO, AP

Date Reviewed: March 20, 2010

Strengths:    Bike is like a TANK!!! Disk brakes are awesome... though i have to work on them because they don't stop the bike they i think they are supposed to.

Weaknesses:    seats a little uncomfortable, but that might just be me. shifting gears isn't as smooth as other revies say. When in some gears it clicks a lot.

Bottom Line:   
When i look at it, its like really pissed off bull that wants to kill me, but when i get on its like a bull that'll go through anything and then try to kill me. I LOVE IT!!!!!!

Expand full review >>

Favorite Trail:   HAVEN'T RODE ONE YET

Duration Product Used:   Less than 1 month

Price Paid:    $275.00

Purchased At:   EBAY

Similar Products Used:   First mountain bike, used to ride dirt trails on my bmx

Bike Setup:   pretty much stock i think. the company "bontrager" used a lot.

Overall Rating:5
Value Rating:4
Submitted by Dale a Weekend Warrior from Virginia Beach, Va.

Date Reviewed: February 28, 2010

Strengths:    Pretty lightweight for it's intended use. Sweet color choices for 2010.

Weaknesses:    None so far

Bottom Line:   
Let me start by saying I'm pretty much a novice when it comes to mountain bikes. All I wanted was a good quality bike I could get some exercise with on both pavement and some light trails. If this sounds like you, read on. I bought the 2010 3900 disk and love this bike. I test road a friends 3700 and can tell you this much. Get the disk brakes. World of difference. For the price, you can't go wrong. I've tried some harder trails and this bike keeps up beautifully. I can't comment on bombing down a mountain or jumping off a cliff with it. Not designed for that so it probably won't take it. But if you want something like me, just to ride casually that you know will take some abuse, this is it. My other suggestion is to make sure you get it from a good shop. trek's warranty is awesome already, so all you have to really worry about is service.

Expand full review >>

Duration Product Used:   3 months

Price Paid:    $500.00

Bike Setup:   Stock

Overall Rating:3
Value Rating:4
Submitted by Andrew a Weekend Warrior from Almaty Kazakhstan

Date Reviewed: January 27, 2010

Strengths:    Good price, strong front suspension, good black color

Weaknesses:    Bad choise for city dert, bad for jumping

Bottom Line:   
It's may be Your first bike for MTB. First expirience for guys with no ambitions :-)

Expand full review >>

Duration Product Used:   More than 3 years

Price Paid:    $350.00


Overall Rating:4
Value Rating:5
Submitted by nickav21 a Cross Country Rider from Bartlett, TN

Date Reviewed: December 24, 2009

Strengths:    Pretty light-weight frame, good component mix for the price, compared to other bikes at that price range, totally dominates when it comes to components, etc

Weaknesses:    The tires SUCK, plastic pedals

Bottom Line:   
Great bike for the price. I've only had it for about 3 months but have ridden it pretty hard almost every day since I got it. It really impresses me every time I take it out! At this price it's easy to justify upgrading when stuff breaks too, so I'm not bothered by the fact that the components are not top of the line.

I gave it 4 flamin chilis for overall rating only because the saddle and pedals are junk! No biggie though!

Expand full review >>

Favorite Trail:   Stanky Creek

Duration Product Used:   3 months

Price Paid:    $560.00

Purchased At:   Bikes Plus Bartlett

Similar Products Used:   Gary Fisher Wahoo

Bike Setup:   Stock except for WTB saddle and Mallet 1 pedals

Reviews 1 - 15 (46 Reviews Total) | Next 15

Review Options:  Sorted by Latest Review | Sort by Best Rating


Trek 3900 upgrade

I'm newbie and I recently bought Trek 3900 Disc. What's done - it's done. After about 200 kilometers of the offroad ride I realized that although this 18" frame fits me perfectly and I like the geometry, the brakes are terrible (Promax mech disc), rims are not for xc (single walled 26-er), and derai ... Read More »

trek 3900 disc w/ bb7

After failing to get my extremely crappy tektro novela brakes to work for me, i have decided to get some respectable brakes so that i can feel safe and confident on the trails. My only concern is if bb7's are compatible with my rotor or if a new rotor can fit on my hub. Can anyone help me out? Thank ... Read More »

Trek 3900 Disk Brake Help

Ever since i purchased my trek 3900 almost a year ago the brakes have been pretty much crap. They are tektro novela disc brakes and they have basically no stopping power. The first day i got the the bike they were disappointing so i tried adjusting them, and ended up shooting wd40 inside the brakes ... Read More »

Completed a Century Ride yesterday on my Trek 3900!

102 miles. Ride time = 8.18 min. Total time = 9:20 min. Avg Speed = 12.2mph. From my other post a few weeks back after my 75 mile ride, I was sure to take everyone's advice as I took a GU protein pack and hydrated with at least 1/2 a canister of fluid every hour on the hour. At the 50 mile mar ... Read More »

Trek 3900 frame? Can I rebuild her?

My brother was about to toss what was left of his son's Trek 3900 in the dumpster. Frame looks OK, but nothing parts-wise is salvagable. Is it worth keeping the frame and rebuilding her? I have little knowledge of bikes, but was thinking how it would be nice to replace my tired old Schwin ... Read More »

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