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rkinkade
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Triumph Thruxton / production racer brake pedal.
#762240 01/11/19 7:40 am
Joined: May 2012
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jimq Offline OP
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Hi. Does anyone out there have any detailed information on Thruxton brake pedals. I would like to make one for a product race clone 500 triumph. Or alternatively a supplier for such an item.

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Re: Triumph Thruxton / production racer brake pedal.
jimq #762705 01/16/19 12:59 pm
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The Thruxtons were modified from stock T120 Bonnevilles.
Most used the 1963-64 rear brake set-up, with the control rod running outside of the rear shock absorber, and with the off-set lever on the brake backing plate. This is similar to how the 350 and 500cc unit Triumphs operated the rear brake.

That also enabled the Thruxton's rider to locate the brake pedal pivot bolt's position up or down on the left rear engine mount to suit his preferred riding position.

That pivot bolt is longer than the standard Bonneville one, because it also served as the mount for the left-side foot rest.
Thus the brake pedal must be shorter so the rider's foot can reach it.

It appears (to me) that a modified unit 350/500cc brake pedal was used on the Thruxtons. It probably was cut shorter.
What had been the front end of the pedal was removed and the cut end bent outward to make a new treadle for the rider's foot to apply the brake. This would be in keeping with "production-class' rules which specified that parts had to be "factory' parts or 'modified" factory parts, and that welding was not allowed on modified parts.

This is also how the competition brake pedals were made for the pre-unit road racers in the late 1950s.

This is how i see it, but I am sure another reader of this site will shed more light on this.




Re: Triumph Thruxton / production racer brake pedal.
jimq #762730 01/16/19 11:54 pm
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Try Hoppybikes (George Hopwood)

http://www.hoppybikes.co.uk/frame.htm

I bought a pedal listed as 'thruxton' from eBay and have attached some photos. I've seen another like it on a bike image gleaned from the web, but have no idea how close to the 'original' it would be. Its hard to find an image on the web with sufficient detail, and in any case they look to vary across 'original/genuine' Thruxtons that you can find images for. I've also included a shot of the relevant bit of the 'alternative parts list' Search the site it's been shown here in full. My image is reproduced from "Triumph Thruxton Bonneville 1959-1969" by Claudio Sintich.

Attachment manager seems to have gone down so PM me (and let me know you have) if you want more detailed photos.

Cheers
Ray

Attached Files IMG_3436.JPGIMG_3434.JPG

BSA 1969 A65F
BSA 1966 A65H
Triumph 1968 T120
Kawasaki A1R
& too many projects!
Re: Triumph Thruxton / production racer brake pedal.
jimq #762760 01/17/19 1:09 pm
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Brizzo, that's what the pedal would look like.

As i understand it, these were made by the apprentices in the factory's competition shop. The end of a stock pedal would be cut off, then the cut end would be heated, bent over to make the new treadle, then the apprentice would use a saw to cut the cross-hatch grooves to make the new anti-slip "treadle."

This looks like it was made the same way as the 1954-1959 race kit one I have in my collection.

Re: Triumph Thruxton / production racer brake pedal.
jimq #762761 01/17/19 1:19 pm
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I bought this off eBay, it was not described as being Thruxton but looked close to what was needed so I bought it, doubt its factory but likely to be made at home.


[Linked Image]

[Linked Image]

[Linked Image]

[Linked Image]

I have the correct 63/64 brakeplate lever to bring the rod outside to meet the pedal rather than the 65 onwards inside the engine plates.




Re: Triumph Thruxton / production racer brake pedal.
jimq #762764 01/17/19 1:50 pm
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It was very likely made from a 500 brake pedal. but someone did a great job of making it.
It looks better than the factory job.

Sometimes on Thruxtons you will see several holes drilled in this engine mount plate.
This allows the rider to adjust the foot rest/brake pedal to where he is comfortable with it.

Re: Triumph Thruxton / production racer brake pedal.
jimq #762771 01/17/19 2:44 pm
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I am not using it on a racer or replica, just need to ease the pressure on the hips from have legs too short and the pegs too far forward, I get the added benefit of being able to just turn the gear lever backwards to get a gear change pattern to match all my other bikes. On the engine plate the pedal bush is retained as the pedal seems to need it, so unless you add a separate bush to the shaft then there is only one position.


This is the photo I was trying to replicate.

[Linked Image]


Re: Triumph Thruxton / production racer brake pedal.
jimq #762803 01/17/19 9:01 pm
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Kommando, It makes a very neat, clean conversion, doesn't it?

Re: Triumph Thruxton / production racer brake pedal.
jimq #762844 01/18/19 11:12 am
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Yes, a true KISS design, just what's needed in its simplest form.

Re: Triumph Thruxton / production racer brake pedal.
jimq #762913 01/19/19 1:56 am
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Irish.

That's definitely the construction method. Looks like a forging or casting that is bent to shape and the grooves cut in. Inside the rubber is a threaded tube that screws onto the end of the pedal carrier. Well I thought it was threaded, just held on with thread tape!!

There's remnants of a casting # on the pedal. See image. Maybe someone can decode that.

Ray

Attached Files IMG_3439.JPGIMG_3440.JPGIMG_3437.JPGIMG_3438.JPGIMG_3441.JPG

BSA 1969 A65F
BSA 1966 A65H
Triumph 1968 T120
Kawasaki A1R
& too many projects!
Re: Triumph Thruxton / production racer brake pedal.
jimq #762916 01/19/19 2:11 am
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TRIUMPH MOTORCYCLES Twins & Triples by Tim Remus (Motorbooks International) p66 has an image you might find useful (a close-up is shown here)

Good luck with it.

Ray

Attached Files IMG_3446.JPGIMG_3445.JPGIMG_3444.JPGIMG_3442.JPGIMG_3447.JPG

BSA 1969 A65F
BSA 1966 A65H
Triumph 1968 T120
Kawasaki A1R
& too many projects!
Re: Triumph Thruxton / production racer brake pedal.
jimq #763040 01/20/19 4:38 pm
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jimq, I have found anl answer to your question:

I studied the photo above of the original "Thruxton" 650 brake pedal.

This morning, while rooting through my old parts, i found a 1963-64 650cc brake pedal, complete with it's mounting / pivot pin.

The rear of it is identical to that of the "Thruxton" pedal pictured. It appears that Triumph's competition shop cut '63-64 pedals and modified them as shown to make the "Thruxton" brake pedals, and used that same '63-64 mounting / pivot pin to mount them to the bikes.

Re: Triumph Thruxton / production racer brake pedal.
jimq #763042 01/20/19 6:01 pm
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Jimq has not been back to the forum since his first post, hopefully someone else will find the info useful later.


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