British Customs 18T/19T Front Countershaft Sprocket Triumph Bonneville / SE / T100 / Thruxton / Scrambler
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  • British Customs 18T/19T Front Countershaft Sprocket Triumph Bonneville / SE / T100 / Thruxton / Scrambler
  • British Customs 18T/19T Front Countershaft Sprocket Triumph Bonneville / SE / T100 / Thruxton / Scrambler
  • British Customs 18T/19T Front Countershaft Sprocket Triumph Bonneville / SE / T100 / Thruxton / Scrambler

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British Customs 18T/19T Front Countershaft Sprocket Triumph Bonneville / SE / T100 / Thruxton / Scrambler

Highway cruising on your Modern Classic an get a buzzy at speed. Its ok to admit that you’ve tried to click up another gear when hitting the highway -- we’ve done it too. To make interstate travel a smoother af-fair, British Customs has engineered a lightweight countershaft sprocket that allows riders to easily adjust their gearing ratio (see video instructions).

Each sprocket is manufactured from 8620 case-hardened steel and CAT plated with lightening holes to provide reduced weight compared to the stock sprocket. The BC sprockets are visually appealing and made to last, meaning they look fantastic when exposed with the British Customs Front Sprocket Cover delivering a true hot rod look.

Gearing Basics:

Going up one tooth from your bike’s stock configuration is a great alter-native for freeway riding and feels like you’ve added a 6th gear to your Triumph Modern Classic. Changing the number of teeth on your countershaft sprocket has the same effect as changing your rear sprocket by two teeth. Increasing the number of teeth of the countershaft sprocket will give you the feeling of adding another gear on the freeway.

If you are looking for more get up and go out of hole, drop down a tooth. The lower the tooth, the faster out of the hole, more push off the line, and less top end (top speed).

Features:

  • Changes gearing performance
  • Replaces worn sprocket
  • Case-hardened, plated steel
  • Drilled for looks and weight savings
  • Matches retro sprocket
  • Fits 525 sized chain
  • Made in USA
4.4 / 5
Bang For The Buck
4.4 / 5
Features
5 / 5
Style
5 / 5
Ease Of Install
4.2 / 5
Fit & Finish
5 / 5
Durability
4.2 / 5

Fitment Notes & Exceptions

  • Bikes built in early 2015 will accept this sprocket, refer to the last 6 digits of your VIN number:
    • Scrambler - Up to VIN 694349
    • Bonneville - Up to VIN 694351
    • Thruxton - Up to VIN 694349

This Product Fits:
Triumph
Bonneville 20002015
Bonneville SE 20002015
Bonneville T100 20002015
Scrambler 20062015
Thruxton 20042015
Product Style RevZilla Item # Manufacturer Product # Availability
18 Tooth 1019441 BC704-001-18 Available: Requires 3-5 business days lead time prior to shipment
19 Tooth 1019442 BC704-001-19 In Stock: Ships next business day

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Returns

If your order arrives and it is not right, we will we'll fix it, NO NONSENSE, we promise.

Doesn't fit or just not happy with it? You can return any new, unused and unaltered item within 30 business days of delivery receipt of your item. We will issue a full refund to your original payment method.

See our full Return Policy for all of the pertinent details.

Write a Product Review for a chance to win our monthly $100 giveaways.
4.4 / 5.0
5 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
4
0
0
1
0
Bang For The Buck
4.4 / 5
Features
5.0 / 5
Style
5.0 / 5
Ease Of Install
4.2 / 5
Fit & Finish
5.0 / 5
Durability
4.2 / 5
Bang For The Buck
5 / 5
Ease Of Install
5 / 5
Durability
5 / 5
Sprocket Change Triumph Thruxton
I purchased the nineteen tooth sprocket for my 2015 Triumph Thruxton Ace. I noticed that the bike seemed to need a 6th gear when at high way speeds. I also noticed that the factory speedometer was optimistic by about 6 miles per hour. I confirmed this with a Yori Moto digital speedometer.
I installed the new sprocket, it was easy, I dropped about 300 RPM off at the same speed, and now my speedometer reads correct with no changes to the ecm. I like the new gear, first is a little taller and bike is more relaxed at hwy speeds! If you are thinking about doing this mod to your bike, go for it! You will love the lower RPM, better fuel economy, and have better drivability on the interstate with out sacrificing fun!
August 31, 2015
Bang For The Buck
5 / 5
Ease Of Install
5 / 5
Fit & Finish
5 / 5
Durability
5 / 5
Just what I needed
I got this to take a little strain off the engine during the long highway stretch to work. Dropped the engine RPM by a little bit, but it was enough to take some vibration out of the handlebars too. Seems to have corrected the speedometer and was easy to install.
September 19, 2016
Bang For The Buck
2 / 5
Ease Of Install
1 / 5
Durability
1 / 5
Excellent customer service!
I ordered an T18 front sprocket for my 2014 triumph scrambler. When it arrived it looked great but to my disappointment, it didn't fit my bike for some reason. Weather it was a fault in manufacturing or the Australian version has a slight difference to the U.S. we couldn't figure out but the customer service team did the best they could to help me.
We tried to come up with a solution, but in the end they were happy to refund the cost of the part.
I'll definitely keep buying stuff from you guys! Thanks again
February 10, 2016
Ride:
2014 Triumph Scrambler
Bang For The Buck
5 / 5
Features
5 / 5
Style
5 / 5
Ease Of Install
5 / 5
Fit & Finish
5 / 5
Durability
5 / 5
No more looking for 6th gear
Rides smoothy. InitiallyI had concerns about losing power, but I've not noticed any drop in torque, and it calms the motor down a bit at highway speeds (75-80 mph). I did have to adjust my speedo, but that wasn't too difficult.
June 12, 2017
Purchased
4 months ago
Bang For The Buck
5 / 5
Ease Of Install
5 / 5
Durability
5 / 5
19t front sprocket
its what I needed. sturdy. came in quick easy to find on the website.
August 2, 2016
Purchased
1 year ago
Use our Product Q&A for a chance to win our monthly $100 giveaways.

Have a functionality, fit, or otherwise product-specific question about the British Customs 18T/19T Front Countershaft Sprocket Triumph Bonneville / SE / T100 / Thruxton / Scrambler? Ask it here! If you have a customer service or shipping question, please direct it to our Customer Service department.

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Browse 7 questions Browse 7 questions and 14 answers
Why did you choose this?
RevZilla Store
To lower rpms at hi-way speeds.
Steven P on Jun 5, 2017
Better highway cruising efficiency.
Eric D on Apr 2, 2017
To lower rpms at hi-way speeds.
Steven P on Jun 5, 2017
want to bring rpm down at hi-way speeds
kevin h on Apr 21, 2017
Better highway cruising efficiency.
Eric D on Apr 2, 2017
I use this bike to commute and need a highway gear.
Matthew C on Jan 22, 2017
suits my bike to a T
luke m on Jan 2, 2016
want to bring rpm down at hi-way speeds
kevin h on Apr 21, 2017
I use this bike to commute and need a highway gear.
Matthew C on Jan 22, 2017
will this 19 tooth sprocket fit a 520 chain?
A shopper on Jan 6, 2016
I have a 2014 Triumph Bonneville will the 19T counter spricket work on my bike?
A C on Mar 22, 2017
BEST ANSWER: It should fit. There appears to be no differences between the '13 and '14 bonnies. It's a good upgrade, but the bike really needs a sixth gear.
2014 T100 can be changed for the 19T Front Countershaft Sprocket ?
A shopper on Jan 10, 2017
BEST ANSWER: It should work. I have a 2013 Bonnie. To be honest, anything that gears this bike higher is a blessing. What it really needs is a 6th gear, but the 19 tooth sprocket will have to do. Hope that helps. And yes, I would do it again.
Hi, I have a 2015 Triumph Speedmaster with a DID VP2 520 chain and sprockets (6mm), will the 19T sprocket fit my bike?
A shopper on Jun 10, 2015
BEST ANSWER: This one will not fit, a 520 chain needs a 520 sprocket. Good news is British Customs makes both..
Will this sprocket fit on a 2006 yamaha 4t0r?
A shopper on May 24, 2017
Hi, I have a 2015 Triumph Speedmaster with a DID 520 VR2 chain and sprocket on fitted, will the 19T sprocket fit my bike?
A shopper on Jun 10, 2015