THOMSON Elite X4 - User Manual

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Elite , Elite and BMX Elite , Elite and BMX

L.H. Thomson Co. Inc. 7800 N.E. Industrial Blvd.

Macon, Georgia USA 31216-7748

phone: 478.788.5052

email: bikes@lhthomson.com

www.bikethomson.com

Carbon Fiber and Aluminum Steerers

Congratulations!

THANK YOU for purchasing the Thomson Stem. The following instructions

should be read completely before installation. If you have any questions

regarding installation or service of this product, please contact your local

dealer. We recommend that a professional bicycle mechanic install and

service this product.

Before starting assembly

Carbon,

Aluminum

or Steel

Steerer Tube

Grease all of the bolt threads and the threads inside the stem

before assembly. All bolts are identical.

Important: For carbon ber steerer tubes refer to the manu-

facturer specications on how to cut and nish the steerer

tube.

Important: For carbon

ber steerer tubes refer

to the manufacturer

specications on how

to cut and nish the

steerer tube.

Using a torque wrench,

alternate tightening

each bolt in small

amounts until both are

tightened to 5.5 Nm

Make sure there is an

equal gap between the

handlebar clamp and the

stem body. Using a torque

wrench, tighten the four

bar clamp bolts to 4.0 Nm

Make sure there is an

equal gap between the

handlebar clamp and the

stem body. Using a torque

wrench, tighten the four

bar clamp bolts to 5.1 Nm

Using a torque wrench,

alternate tightening each

bolt in small amounts until

both bolts are tightened

to 12.4 Nm

Tightening Process for and Steerer Clamp Bolts

Tightening Process for Bar Clamp Bolts

Tightening Process for BMX Stem Bolts

Torque Pattern for Tightening BMX Stem

Bolts

For steel and aluminum steerer tubes: Remove any burrs from the

steerer tube; do not remove any base metal. File a smooth radius

around the top edge as shown. If the Thomson Stem has a burr at the

point of contact with the steerer tube, handlebar, or clamp, remove the

burr with 400 grit sandpaper.

Steerer tube

Smooth nish

Make sure there are no burrs.

Degrease the steerer

tube, the inside of the

Thomson Stem and the

steerer clamps before

assembly. Rubbing

alcohol is an effective

degreaser.

Before riding, check

that the stem is tight

and properly installed.

Pinch the front wheel of

the bike between your

knees and attempt to

rotate the bars. The

bars should not twist.

This should be done

before every bike ride.

After installing the stem, check

that the cable housings do

not bind. Check by turning the

handlebar until the grip hits the

frame. If the housings bind,

replace with longer ones.

Tighten handlebar clamp using numbered

torque pattern. Make sure bolts are tight-

ened to 12.4 Nm

Grease

Degrease

Equal gap

does not bind

Steerer should extend 3mm

above stem requiring a 5mm

spacer.

U.S. Patents 6,309,135; 6,945,135; 7,407,176; 7,500,415; 5,123,485 S; 515,983 S; 515,4983 S; 516,965 S; 528,047

E.U. Patents 1,210,261 EP; 021,083,488 PCT; 1,595,778 EP

Need help?

Do you have a question about the THOMSON Elite X4 and is the answer not in the manual?

Summary

Before Starting Assembly

Carbon Fiber and Aluminum Steerer Preparation

Ensure steerer extends 3mm above stem, requiring a 5mm spacer.

Carbon Steerer Tube Cutting Instructions

Follow manufacturer specs for cutting and finishing carbon fiber steerer tubes.

Bolt and Thread Greasing

Grease all bolt threads and internal stem threads; all bolts are identical.

Component Degreasing

Degrease steerer tube, stem, and clamps using rubbing alcohol.

Torque Specifications and Tightening Processes

X4;X2 Steerer Clamp Bolt Torque

Tighten to 5.5 Nm using a torque wrench, alternating each bolt.

X4 Bar Clamp Bolt Torque

Tighten four bolts to 4.0 Nm, ensuring an equal gap.

X2 Bar Clamp Bolt Torque

Tighten four bolts to 5.1 Nm, ensuring an equal gap.

BMX Stem Bolt Tightening

Tighten bolts to 12.4 Nm using a torque wrench, alternating.

BMX Stem Torque Pattern

Tighten handlebar clamp bolts to 12.4 Nm following numbered pattern.

Post-Installation Checks

Pre-Ride Stem Security Check

Test stem tightness by attempting to rotate handlebars with front wheel held.

Cable Housing Clearance

Verify cable housings do not bind when turning handlebars fully.