Hello all,

I bought for the Triumph 3hw a speedometer. Now I am looking for the speedometer drive.

I have to know the model speedo drive and in which direction it turns, because there are some differt models with 90°.
So which one is the wright one?
Maybe someone does have the right one for sale, please lett me know.


I also want to find the gears in to the hub, the gear must be 58teeth and on the speedmeter drive shaft 18teeth.

email (option): bsa-m20@libero.it

Does somebody knows the ratio for the speedometer drive Triumph 3hw.

Is it also the same one as for the Norton 16H?

email (option): bsa-m20@libero.it

All those angle speedo drives are the same ratio and even use the same body. But of course they rotate in opposite directions depending on which side the drum is. A Norton 16H brake drum is on the left, whereas a Triumph is on the right. Ron

email (option): ronpier@talk21.com

Cornucopia in Germany list the 3HW speedo drive cogs...........not cheap, but the Triumph type are not exactly standard........

Thanks Steve, I will try at cornucopia.

I asked some other dealers, but also they don't know what type it was mount on.
If it was the same one as for the Norton, BSA km20 or an other model , it was easier to find one.

Regards, Richard

email (option): bsa-m20@libero.it

The KM20 speedo drive is not a screw in type. It looks similar but is held in with a clamp, like the one on my C10.

The 3HW drive could also be used on Ariel W/NG, Velocette MAC etc. I don't think this information will make it any easier to find one. I'm not sure that Cornucopia has the internal gears but please let us know if he does.

Here is my C10 and 3HW together. Ron

email (option): ronpier@talk21.com

Cornucopia list the two sprockets Ron, not the internal gears of the speedo drive.........(the one for the hub and the smaller 18-tooth one for the end of the speedo drive)...........but worth asking them about the internal gears though.....

Hello Ron,

I already called him today, but he wasn't in the shop.
So I send him an email, I have to wait for an answer.

The gears inside the hub are 58teeth as I said before, but 18 or 19 teeth for the drive and that depent on the high/size of tire.

email (option): bsa-m20@libero.it

Yes Richard/Steve, those are the gears I meant. The two inside the hub that Richard already called for. The trouble with Peter Long's catalogue is, he hasn't updated it in years However he does sell some of the best reproduction parts on the market.
Geof Meyers had some NOS 3HW drives a couple of years ago, but I think they are all gone? But worth a shout. gimyers@mac.com

Ron

email (option): ronpier@talk21.com

Hi Ron...That's 'gjmyers' not 'gimyers'.....Ian

email (option): ian@wright52.plus.com

Quite right Ian. Since I turned 40-27! All together now:-.... My eyes are dim I can not see, I have not brought my specs with me

Ron

email (option): ronpier@talk21.com