Triumph Pre Unit GRAND PRIX GP500 gearbox – Race, Competition rarity – SOLD

Triumph Pre Unit GRAND PRIX GP500 gearbox – Race, Competition rarity – SOLD


Gone to France

Triumph Pre-Unit Rigid Sprung hub / Frame gearbox.

This early 500 / 650 gearbox is unusual. Aside from the normal unique number stamped on the main case, there are three letters stamped inboard. They are “R-NB”. The only times that I have seen additional stamps, in the same location, have been on Close Ration (CR) and Wide Ratio (WR) gearboxes. However, I am reliably informed (thanks Stig) that the special stamps are for the rare Triumph Grand Prix motorcycles. Triumph produced less than 200 GP bikes. R = Grand Prix and NB relates to the fact that it used Needle roller Bearings.

As this is a very rare and sought after GP gearbox, I would prefer to sell to someone who will be using it in a Triumph GP. It can be used in other Triumph rigid framed bikes, including the Trophy.

This particular GP gearbox was dispatched to Humphrey & Andrew on 24th September 1948.

Please have a good look at the images. The main case has a cast number T264A. The gearbox has a unique number: TE07040.

Condition. The box has the selector indicator and the casings are OK and free of cracks or welds. It clicks through the gears.

The clutch adjuster mount is still in one piece. (They are usually broken off). However, it will need a little welding to make it secure. It comes with the clutch arm.

Both mountings are good.

It turns over freely. You will have noticed that the gear lever has been turned through 180 degrees. Presumably, the last owner actually used it for competition as intended.

The sprocket teeth look OK. Sprocket number is T471.

Overall, this is a nice Triumph Grand Prix gearbox. If you happen to have a Triumph GP motorcycle, you are very fortunate and this original GP gearbox would be a great asset.

It’s being sold as a gearbox needing rebuild as I haven’t opened it up, it even though it turns fine.

International shipping available. Please ask. Australia, NZ, Singapore, USA etc. Just ask.

Viewing: Please come and check it over before you buy. It is at PE28, near St Ives in Cambridgeshire.

Shipping: I usually ship to most destinations. If you don’t see a price, please ask. Thanks. International shipping available.

Collection: If you don’t want it shipped, I have plenty of space. If you can’t collect for a while, it’s not a problem. However, I will need to be paid very soon after the sale. Thanks.

Payment: Good old fashioned money on collection is preferred. I can accept payment through PayPal or by bank transfer as well.

Import Taxes: Please note that IMPORT DUTIES are not something I can control. If you are buying from outside the UK, there is a chance that you will have to pay import taxes. Import taxes vary from country to country. If there are charges to pay, it is the buyer’s responsibility to research the cost and pay the duties. The price that you see on my advert is for the item and not the item plus whatever taxes might be due.


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