Progressive fork springs for Triumph Street Twin 900cc


TEC upgrade progressive fork springs kit with instructions which fits Triumph Street Twin.  They will not fit the updated models from 2019 onwards as these have different suspension specifications.

Straight replacement for the standard liner triumph fork springs with no modification required.  Comes with the necessary spacers.

Huge improvement in travel comfort and handling over stock springs with reduced crashing over bumps and less dive in braking.

Highly Recommended with our rear shock upgrades for a total transformation of your bikes comfort and handling or we offer a no quibble full refund!

12 month warranty

Detailed instructions provided.

Customer Reviews

Based on 7 reviews
What a difference a spring makes

Just fitted and tested TEC's Progressive Fork Springs on my 2018 Street Cup, wow, so much better; smoother over bumps, more precise and responsive steering and better feedback from the road. They're about 4mm shorter than the springs Triumph fitted, I'm not using ride height adjusters (I want a standard look at the front end and I'm not that heavy) so there may be a slight change to the steering geometry but for me it was very much for the better.

I returned to riding 18 months ago after a thirty year gap and was disappointed that the front end seemed harsh and vague, with slow steering and poor feedback from the road and tyres. Much online research led to change the tyres and/or the fork springs. A couple of emails to TEC (quickly responded to thanks) and George's excellent fitting videos made up my mind to go for the springs and I'm so glad I did. Best £60.00 I've spent, why didn't triumph fit these in the first place? The tyres still need to go, but until then riding this year is going to be so much fun.


a great improvement over the stock springs, the bike feels safe on bumpy bends now, and the overall ride is smoother. love your work George.

Street Twin progressive springs

Parts arrived promptly, fitted easily. Have not ridden the bike yet but have used these springs on a previous bike and they made the ride much better so I am expecting the same. Great service support.


Have made a big difference


These progressive springs really improve the overall handling on the front of the bike. The bike is more estable on straights, corners, dives less under braking and the confort is really improved when riding through pot holes and the likes.

The bike should have brought progressive springs from the factory.