MTFCA Forum

I lost my teethes !!!!

Does anyone has a picture of the 1927 AC speedometer system on the wheel when complete ?

What material is this ?

And a way to retrieve, buy, or re-manufacture such spare part ?
car is a January 1927 Model T Touring with wire wheels option (named "Poupette")

The gear is fiber and is missing it's teeth. The driving gear on the wheel is very worn. I think that if you tried to mate a new driven gear it will wear the teeth very quickly. The piece that fits on the wheel is somewhat common in the US, the fiber gear not so much.

Thanks Mark for your expertise,
Following your advise that looks perfectly adequate I have purchased a new set of the piece that fits in the wheel, on eBay, now, should receive it home this week, and now needs to find a new gear or a way to make it ....

There were 2 different tooth counts on the fiber driven gear, 20 teeth for 30" high pressure (clinchers) and 21 for 21" low pressure(wire) wheels. The one shown in the photo is the 20 tooth type. My OP; the 20 tooth might put you more in the ball park of a correct reading (the one in the photo is not for sale at this time) because of the over sized tires commonly sold today being closer to having an outside diameter of approx 30" US. The driving gear on the wheel is the same for both types of driven gear, having 30 rectangular holes.
There are two types of the gears that mounts to the wheel; one with 3 mounting holes and one with 4. The one with 4 to be used with the wire or wood wheels.

Thanks for your very clear details and the 3 pictures

Today I have found that a "Speedo Driven Gear-T-17260-FG" 12 teeth fits well in the wheel gear so I can probably attach it on my "without teeth" fiber driven gear and then have km and km/h instead of miles and mph ... why not ?

Even if you can get the gear shown dished to the proper angle, the teeth count is way off and may not fit the spacing of the holes in the wheel gear. In the event you can get that far, the construction used in making the gear, the teeth may just sheer off. But heck, give it a try.
https://www.ebay.com/itm/Model-T-Ford-A ... 1839663355

Thanks so much Mark. I have purchased the "Model T Ford AC Speedometer Drive and Cable MT-3254" on eBay and will try the 2 solutions, either adapt the modern 12 teeth gear at receipt of the new wheel gear, and have the possibility to come back to an original AC gear when receiving it (estimated = Sept 3rd)

That 12 tooth gear you have shown in your photo is for a Ford Special speedometer - won't likely work no matter how you modify it.