TECHNOLOGY STORIES BIKE INFO, GEOMETRY ... - Vintage Trek

100
Tandem
New for 2002
Trek is re-entering the tandem market. This is
an entirely new frameset which meets the needs
of the performance tandem enthusiast in fit and
function.
Geometry
Using what we know about bike fit, garnered
over years of making lots of great bikes, the tandem
was designed to replicate the fit from those
bikes. Essentially what we did was make the captain's
sizing mimic the positions of those found on
riders from 5'7" to 6'2". Then we made the stoker's
position as adjustable as possible, fitting from just
under 5' to about 5'11".
Ride
The main performance issue with a tandem
is frame rigidity and handling. We used FEA
(Finite element Analysis), a powerful computer-aided
design program, to find which tube shapes and
sections would best address the needs to the riders.
Our unique boom-tube shape is an obvious
visual example. What you cana't see under the
paint is the unique wall shapes that make this tue
about the stiffenst in the market for its intended
use.
So what does all this mean? Pound for pound, we
think you'll find our Trek tandem is the best riding
tandem on the market, regardless of cost.
Frame details
Our tandems are designed to be as versatile as possible.
As such, they have brake mounts for road calipers,
cantilever or direct pull brakes, discs, or drums.
We know that some tandem riders like to do a lot of
miles, so we put 4 water bottle mounts on every size.
We chose a headset size of 1 1/8" to allow the owner
as much choice in components as possible. With modern
technology, This systems is plenty strong and durable,
plus there are lots of forks, headsets, and stems to
choose from at your local dealer. The lack of custom
parts means a user-friendly experience over the life of
the bike.
For the mechanic
Stoker stem adjustment
Tighten seatpost clamp bolts to 100-120 lb in
(11.3-13.6 Nm).
Tighten stem extension clamp bolts to 120-140 lb in
(13.6-15.8 Nm).
Timing chain
The timing chain connects and synchronizes the two
pedal cranks on the tandem. The tension of this chain is
adjustable and must be correct for safety and to extend
the life ot the drivetrain parts. When grasped in the
middle of the chain run between the front and rear
sprockets, there should be a total of 1/2 to 1 inch (12-25
mm) total vertical movement.
To adjust the timing chain tension, identify the
expander bolt on the captain's bottom bracket eccentric.
Loosen this bolt several turns. Hold the eccentric with
an allen wrench and rotate the eccentric until the
desired chain tension is achieved. Retighten the expander
bolt to 75-100 lb in (8.5-11.3 Nm).
MILLIMETERS
INCHES
Frame sizes
Head angle
Seat angle
Standover
Seat tube
Head tube
Eff top tube
Chainstays
BB height
Offset
Trail
Wheelbase
Standover
Seat tube
Head tube
Eff top tube
Chainstays
BB height
Offset
Trail
Wheelbase
2002 Trek Technical Manual
S M L
72.5 73.0 73.0
73.5 73.0 73.0 73.0 72.5 73.0
758 689 779 700 797 771
520 440 540 450 560 460
113 120 145
550 565 575
440 440 440
273 273 273 273 273 273
55.0 55.0 55.0
51 48 48
1744 1754 1782
29.8 27.1 30.6 27.6 31.4 30.4
20.5 17.3 21.3 17.7 22.0 18.1
4.4 4.7 5.7
21.7 22.2 22.6
17.3 17.3 17.3
10.7 10.7 10.7 10.7 10.7 10.7
2.2 2.2 2.2
2.0 1.9 1.9
68.7 69.1 70.1