 Speedo gearing |
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| arsprod |
 May 20 2021, 07:45 AM
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#1
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Member  Group: Members Posts: 210 Joined: 14-March 15 From: Indianapolis Member No.: 18,519 Region Association: Upper MidWest  |
I had my speedometer repaired several years ago after it crashed. It's never been correct - exactly 10mph fast. Now it bugs me! My assumption is the repair place (no longer in business, big surprise) used the wrong gearing. Can someone tell me the correct gearing and where to buy parts for speedos? Many thanks
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| Retroracer |
May 20 2021, 12:07 PM
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#2
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Senior Member Group: Members Posts: 641 Joined: 7-July 13 From: Bend OR Member No.: 16,100 Region Association: Pacific Northwest 
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If its "10mph fast" at every speed - then the needle was reassembled in the wrong position (or, has shifted). Nothing to do with gearing.
If the error is proportional to speed - eg. +10mph at 60, +5mph at 30 - then its a gearing problem. Are you running stock rims and OE profile tires? If not, that will also need to be factored in if the gearing seems off.... - Tony |
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| arsprod |
May 21 2021, 06:21 AM
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#3
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Member Group: Members Posts: 210 Joined: 14-March 15 From: Indianapolis Member No.: 18,519 Region Association: Upper MidWest |
QUOTE(Retroracer @ May 20 2021, 02:07 PM)  If its "10mph fast" at every speed - then the needle was reassembled in the wrong position (or, has shifted). Nothing to do with gearing. If the error is proportional to speed - eg. +10mph at 60, +5mph at 30 - then its a gearing problem. Are you running stock rims and OE profile tires? If not, that will also need to be factored in if the gearing seems off.... - Tony Aha! Yes, it's consistent so it's as simple as moving the needle? |
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| Retroracer |
May 21 2021, 10:18 AM
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#4
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Senior Member Group: Members Posts: 641 Joined: 7-July 13 From: Bend OR Member No.: 16,100 Region Association: Pacific Northwest
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So - yes and no!
Yes: it would seem that the fix is "simply" realigning the needle on the shaft, but.. No: in that you'll have to pry off the bezel off to get access to the needle. Removing bezels is a bit of an acquired skill / art form, and its easy to munge one up unless you're well practiced. Given the case you've had your speedo rebuilt, they probably replaced the bezel with a new one - in which case I'd suggest getting either the original shop to fix the issue or contact someone like Palo Alto Speedometer to make things right. - Tony |
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| arsprod |
May 22 2021, 05:58 AM
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#5
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Member Group: Members Posts: 210 Joined: 14-March 15 From: Indianapolis Member No.: 18,519 Region Association: Upper MidWest |
QUOTE(Retroracer @ May 21 2021, 12:18 PM) So - yes and no! Yes: it would seem that the fix is "simply" realigning the needle on the shaft, but.. No: in that you'll have to pry off the bezel off to get access to the needle. Removing bezels is a bit of an acquired skill / art form, and its easy to munge one up unless you're well practiced. Given the case you've had your speedo rebuilt, they probably replaced the bezel with a new one - in which case I'd suggest getting either the original shop to fix the issue or contact someone like Palo Alto Speedometer to make things right. - Tony Understood, I "munged" one up from an old Italian motorcycle! Thanks |
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