My speedometer finally bit the dust (SSM2001/02 1600) and since I couldn't find a real Smiths for a price I'm willing to pay, I wanted to purchase a repo. Seems most of the repos are 80mm vs 60mm, so my search isn't quite as easy as I'd hoped.
I can find a few 80 or 100 MPH 60mm speedos, but none list the ratio. Looking through a couple reference sites, the SSM2001 came on plenty of bikes, but I'm not entirely clear if they can be directly swapped. For example, from a Cub.
My backup plan is upsize to an 80mm and use a mount from a BSA B44 or B25
Going through this right now. Triumphs used a 1.25/1 ratio hub drive and Bsa's use a 2/1 rear hub drive. BUT, you should pull the hub drive off and check your's since they might have used a Bsa unit. It will be marked on the inside ring. I'm going to use a Tri T140 gauge bracket, shiny and just clamps under the fork tube bolt.
Looking through a couple reference sites, the SSM2001 came on plenty of bikes, but I'm not entirely clear if they can be directly swapped.
Bear in mind though that any original Smiths you buy is likely to need to go to someone like Nisonger for a service?
Originally Posted By: stugs
backup plan is upsize to an 80mm and use a mount from a BSA B44 or B25
The TR25W tacho. is an "80mm" (3"?) so, if the B25 uses a 3" speedo., possibly Meriden's use of a "60mm" speedo. was a small attempt to make the TR25W a bit more than just a re-badged BSA?
The more-expensive ($50-$60?) repos. have been around for at least ten years and appear to be good, restorers I know who've used 'em like 'em. I've only seen the really cheap repos. from India in the last year or so, dunno what their quality's like. Only thing you have to watch with the 'more expensive' repo. speedos. is the trip reset knob is fixed and not in the same position as the Smiths' one. First one I used, I fitted in an oif-type rubber mounting and that was fine, last one I tried was in a '69/'70 triple's rubber binnacle and that wasn't even close.
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Thanks for the replies. I did some searching on the forum and it appeared that rebuilding my speedo was going to be close to purchasing a NOS which is about $300. While not horrible, it's overkill for this bike. This is more of a dd vs something I'm planning to restore.
I guess I'm going to go dig through Raber's used parts section and see if I can't find that B44/B25 mount after checking that hub drive. As my speedo said 1600 I assumed it was 2:1, but I should know better than assume these things