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Buell Forum » Old School Buell » Archives OSB 001 » Archive through June 04, 2005 » S2 Speedo Drive Ratio? « Previous Next »

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Izakwould
Posted on Wednesday, May 11, 2005 - 05:00 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Does anyone know the speedo drive ratio for an S2 Thunderbolt off the top of their head?

Thanks.
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Firemanjim
Posted on Wednesday, May 11, 2005 - 09:20 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Its a HD part so its whatever they use.Just remembered it was hard to find an aftermarket speedo that went higher than stocker.So its different than the jap/euro bikes.
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Aaomy
Posted on Wednesday, May 11, 2005 - 09:38 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

the only help i can give is that the drive unit on the wheel is a stock sportster part,(67127-84A).. this fits 84-94sportsters, fx, fxr, and 94-95 dyna glides with 19" narrow fronts.. of course s2 also..and they list it as a 2:1 ratio..this is the only book info i can find.. so please take it just as that.. hope some of i may help you on your quest.
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Phat_j
Posted on Wednesday, May 11, 2005 - 11:50 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

kinda funny how a 19 in and a 17 in have the same ratio... but mine is extreamly accurate, as at 86mph, i'm registering 85.. this was verified by local authoraties just the other day...
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Izakwould
Posted on Thursday, May 12, 2005 - 11:51 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I haven't been able to verify yet, but it seems like the speed registering on my speedo is a bit faster than actual speed.

The speedo I put on had a 2:1 ratio and supposedly fits front wheel drive FL, FX, FXR & Sportster 1981/1984 (except Softail & FXWG). I'm wondering if the speedo would register a faster speed since my Buell has a smaller wheel diameter than the above models.

For example, when I'm doing what I think is about 80mph, the speedo is registering 100mph or more...
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Phat_j
Posted on Friday, May 13, 2005 - 12:21 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

well your weel is larger than the 16" fl, and smaller than the 19 in fx..... definatly smaller than the 21" wide glide models..
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Sportyeric
Posted on Friday, May 13, 2005 - 12:26 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I think the speedos for different models have different internal ratios. My Sporty got one from an FX and reads 10 percent slow.
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Jackbequick
Posted on Sunday, May 22, 2005 - 10:00 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Interesting thread, a lot of people have access to a handheld GPS and those are great for checking speedometers. Up to 300 mph or so anyway. Get a fix, go to a screen with the large speed readout, and take a ride. You can usually find a way to attach the GPS to the bars or somewhere with a bungee or tape for a brief test. As always, the deal is to do it somewhat in light traffic and don't get preoccupied with looking at the GPS.
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