The Tronsa AKA "Pearl Necklace"

Spec Sheet

General Info

Builder Choppahead Kustom Cycles
Build Time 6 months
Year 1975
Model T140
Ignition Boyer Electronic Ignition
Engine Triumph
Displacement 750
Pistons .060
Heads Bonneville
Cams stock
Carb Amal concentric
Air Cleaner velocity stacks
Exhaust Choppahead custom stainless
Primary stock


Make Triumph
Shifting 5 speed left side


Year 1968
Make BSA
Rake stock

Front End

Type Honda
Extension stock


Front Size 17"
Front Type Avon
Front Brakes Honda disc / Choppahead custom rotors
Rear Size 17"
Rear Type Avon
Rear Brakes Triumph Hinckley / Choppahead custom rotors


Color Satin pearl white
Graphics Pinstriping by One Arm Bandit


Bars Honda clip-ons
Gas Tank BSA
Oil Bag Choppahead custom built
Speedo none
Headlight Lucas
Taillight cat eye

Other Views

The TRONSA aka "Pearl Necklace"

Build Completed: August 2012

This bike is part Triumph (Engine/Tranny/Brakes), part Honda (front end/swingarm), and part BSA (gas tank/frame) - hence the name TRONSA

We were contacted by a customer who wanted something similar to a Honda he saw online. Since we specialize in British bikes we steered him more in that direction.  Especially since something like this hasn't been done before with a Brit powerplant (as far as we knew).   We wanted something that was a mix of form and function - classic and modern.  This is a delicate balance to achieve and have it come out looking and performing well.  We think we hit the mark right on with this custom monoshocked hellion! 

There's a ton of one-off Choppahead custom parts and engineering in this. We love projects like this because we get to flex some and show that our talents go beyond the classic bobbers that we build do to customer demand. 

(Photos: Dastardly Dave Dawson)