Can anyone tell me the difference between a 700, a 720 and an 800 TREK Bicycle. Thanks for all help

1. Trek catalogs are all on line.

2. The differences vary year to year, sometimes the variance is HUGE. For example, in the mid 1980s, a 720 was the top of the line touring bike. In the 1990s, it was a low end hybrid. So without the exact year, there is no way to tell you all of the differences.

3. The 800 is entry level MTB, nothing special. But at the right price (low) why not?

As Thrifty bill says: vintage-trek.com

The 700 Multitrack and the 800 Singletrack are decent frames, but the parts such as rims, shifters, brakes and derailleurs, are value grade and not durable. I have two 700's I candidly bought for $25 each, but have replaced most of the running gear except the rims and crankset.

If you're looking used, spend a little more on a 720 or higher Multitrack and an 850 or higher Single Track mountain bike.

Before


After

Moved from C&V Appraisals to C&V.

As other have pointed out, it depends on when the bike was made. Trek has had a disturbing propensity to recycle old model numbers on completely different new models. C'mon, guys, it's not as if we're going to run out of numbers or something, right?

In any case, when I was working for Trek (1980-86), a model 700 was a "sport-touring" frame using Reynolds 531 tubing -- not an overly long wheelbase, eyelets front and rear, fender clearance, just in case. A model 720 frame was a full-on touring frame using Reynolds 531 tubing -- long chainstays for pannier clearance, multiple bottle mounts, plenty of fender clearance, double eyelets front and rear, and after the first year, cantilever brake mounts. A model 800 frame was more for off-road/hybrid purposes, Tange tubing, 26" wheels, clearance for extra-wide tires, etc.

700s have 700c/27" wheels, 800s have 26" wheels.

Looking at late '80s thru early '90s, the Trek 700, 800 and 900 series have cro-mo frames.

The 700, 720, 720, 800, 820, 830 have plain gage tubes.

The 750, 790, 850 and 900 series have double butted tubes - and are more desirable.

The 700 series have ETRTO 622 (aka 700c) wheels.

The 800 and 900 series have ETRTO 559 (aka 26" MTB) wheels.

I presently have in various stages of work the following: 720 (this one the brake tracks on the rims are too worm for me to feel comfortable), 750 (too small for me, be built in to a drop bar to lend a friend), 850, 930 and a 950.