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Micrometer to measure rim thickness?

Old 09-03-18, 09:15 AM
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SylvainG
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Micrometer to measure rim thickness?

I know about Iwanson tools to measure rim thickness but anybody uses a micrometer? Yes, the spindle/anvil are wider than the Iwanson tips tool but I think it can be beneficial since it can be used to see if the rim is concave or not. One thing I'm not sure is if the anvil/frame thickness will be too big to fit inside my rim. My wheels are Giant S-R2 which I can't find anywhere if it has dimples to know when they are due to be replaced. I bought it used and have put around 7 000 km on them (including rainy ride but try to limit braking with the front wheel when wet).

Thanks

PS. Sorry, this was meant to be in Bicycle Mechanics. Mods, you can move if you so whish.
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Old 09-03-18, 10:58 AM
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Buy yourself a cheap vernier caliper and measure it with the caliper. I just checked the rim thickness on an older bike to see if it works. It is an old Araya 27" rim.

You can get a digital vernier caliper for under $5 from overseas vendors if you are willing to wait. I checked mine against a few thickness gauges and it was spot on. Here's the exact one I used for $3 postpaid 150MM/6inch LCD Digital Electronic Vernier Caliper Gauge Micrometer Ruler Tool $2.99. https://www.ebay.com/itm/150MM-6inch...wAAOSwBP9bjOfl
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Old 09-03-18, 11:02 AM
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Thanks, I already have a caliper but because of the lip on the rim, I can't really use it on my rims
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Old 09-03-18, 11:06 AM
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VegasTriker are you modifying the caliper to accommodate the lip?

Before I got an Iwanson gauge I used a bent spoke to sit proud of the lip but it didnít feel very accurate.
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Old 09-03-18, 11:15 AM
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Good idea, @Spoonrobot. Harbor Freight sells plastic calipers for $2 or so. Grind off material where it makes sense and if it doesn't work, you're only out $2 (or so.)

P.S. Based on this link, the Giant S-R2 wheels should have a circumferential wear indicator in the rim: https://www.ashcycles.com/site/road-...d5ccql6uvd3035
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Old 09-03-18, 11:16 AM
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You'd probably have to get a mic with more pointed anvils.
Here's a pic of a standard Starrett 0-1" mic on a generic 700c clincher rim. You can see how the anvil can't get all the way in there.
Another option to get around the hook, is to hold a small ball bearing on the inside of the wheel, then measure from that to the outside of the rim. Subtract the ball diameter from your measurement to get the wall thickness.
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Old 09-03-18, 12:19 PM
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Originally Posted by Spoonrobot View Post
Before I got an Iwanson gauge I used a bent spoke to sit proud of the lip but it didn’t feel very accurate.
I'd expect that to be fairly accurate, though I might just use a piece of spoke with the ends rounded off.
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Old 09-03-18, 02:35 PM
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The digital calipers can be zeroed out at any point in their range. While measuring the ball or spoke or whatever you will use for a spacer, zero it out, then measure the rim with the spacer. The reading will be the rim's measurement.
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Old 09-03-18, 02:35 PM
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Thanks all for your help

Originally Posted by Spoonrobot View Post
VegasTriker are you modifying the caliper to accommodate the lip?

Before I got an Iwanson gauge I used a bent spoke to sit proud of the lip but it didnít feel very accurate.
Good idea. I do have an old caliper at the cottage that I can reuse.

Originally Posted by ThermionicScott View Post
Good idea, @Spoonrobot. Harbor Freight sells plastic calipers for $2 or so. Grind off material where it makes sense and if it doesn't work, you're only out $2 (or so.)

P.S. Based on this link, the Giant S-R2 wheels should have a circumferential wear indicator in the rim: https://www.ashcycles.com/site/road-...d5ccql6uvd3035
Do you mean the groove around the whole rim? I never thought of it as a wear indicator. If that's it, then I have lots of life left on my rims.

Originally Posted by jasnooks View Post
You'd probably have to get a mic with more pointed anvils.
Here's a pic of a standard Starrett 0-1" mic on a generic 700c clincher rim. You can see how the anvil can't get all the way in there.
Another option to get around the hook, is to hold a small ball bearing on the inside of the wheel, then measure from that to the outside of the rim. Subtract the ball diameter from your measurement to get the wall thickness.
This is what I was afraid of.
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Old 09-03-18, 04:24 PM
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a piece, you keep, that fits under the lip, will be a way to measure the thickness
of the rim and then subtract the thickness of that added piece..

[like weighing a box on the bathroom scale, holding the box in your hands,
then subtracting your weight]


start by measuring the brand new rim as a base line..



...
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Old 09-03-18, 05:21 PM
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I was able to measure the rim thickness on the Araya rim directly but I thought about what I would do if the rim was designed so that there was a thicker part between the wear area and the edge of the rim. You can zero the caliper in any position so the answer is to glue (JB Weld) two small nuts near the end of the caliper so the flat surfaces are parallel. Measure the thickness of the rim and zero the caliper with it closed on the rim. Remove the caliper and close it. It does read negative numbers so your reading will be the thickness of the rim in negative numbers. These calipers are so inexpensive that it would be no big deal to have one that only measures rim thickness.
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Old 09-03-18, 05:46 PM
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Originally Posted by SylvainG View Post
I know about Iwanson tools to measure rim thickness but anybody uses a micrometer? Yes, the spindle/anvil are wider than the Iwanson tips tool but I think it can be beneficial since it can be used to see if the rim is concave or not. One thing I'm not sure is if the anvil/frame thickness will be too big to fit inside my rim. My wheels are Giant S-R2 which I can't find anywhere if it has dimples to know when they are due to be replaced. I bought it used and have put around 7 000 km on them (including rainy ride but try to limit braking with the front wheel when wet).

Thanks

PS. Sorry, this was meant to be in Bicycle Mechanics. Mods, you can move if you so whish.
Hoping to get this in before we all get too technical, why do you need to do this? Canít you see if the rim is concave?
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Old 09-03-18, 05:50 PM
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Use a small ball bearing to Mike over if you can. Just subtract the bearing diameter.

Originally Posted by SylvainG View Post
Thanks, I already have a caliper but because of the lip on the rim, I can't really use it on my rims
use a small ball bearing or pin against the curved surface to measure over. Then subtract the objects measurement from the larger measurement.
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Old 09-03-18, 07:35 PM
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Originally Posted by SylvainG View Post
Do you mean the groove around the whole rim? I never thought of it as a wear indicator. If that's it, then I have lots of life left on my rims.
Yep! As long as that groove is visible, you're good to go.
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Old 09-03-18, 08:19 PM
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Originally Posted by Road Fan View Post

Hoping to get this in before we all get too technical, why do you need to do this? Can’t you see if the rim is concave?

Because it can be concave but still have enough metal to be safe.

Originally Posted by VegasTriker View Post
Buy yourself a cheap vernier caliper and measure it with the caliper. I just checked the rim thickness on an older bike to see if it works. It is an old Araya 27" rim.

You can get a digital vernier caliper for under $5 from overseas vendors if you are willing to wait. I checked mine against a few thickness gauges and it was spot on. Here's the exact one I used for $3 postpaid 150MM/6inch LCD Digital Electronic Vernier Caliper Gauge Micrometer Ruler Tool $2.99. https://www.ebay.com/itm/150MM-6inch...wAAOSwBP9bjOfl
Thanks, too cheap not to buy one

Originally Posted by gsadler1 View Post
use a small ball bearing or pin against the curved surface to measure over. Then subtract the objects measurement from the larger measurement.
It gets complicated when trying to measure thickness at different locations over the rim's circumference. One or two spot might not be enough if the wheel was not always true.

Originally Posted by ThermionicScott View Post
Yep! As long as that groove is visible, you're good to go.
Great, I just checked and the groove is still evident, more on the front than the back but still very visible.
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Old 09-04-18, 06:00 AM
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Instead of a micrometer or vernier/digital caliper with wide jaws, use a dental caliper. They're designed to work in tight spots:

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Old 09-04-18, 02:44 PM
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Originally Posted by SylvainG View Post
Because it can be concave but still have enough metal to be safe.



Thanks, too cheap not to buy one



It gets complicated when trying to measure thickness at different locations over the rim's circumference. One or two spot might not be enough if the wheel was not always true.



Great, I just checked and the groove is still evident, more on the front than the back but still very visible.
I guess from this last post I infer we are interested in gauging the wear on the brake tracks to make sure the rims are safe from fracturing due to brake track wear. Seems to me two tools are needed. One is to capture the thickness of the brake track and keep that setting when it is removed, and then to measure that gap when the first tool is removed. But based on this last comment from Silvain, my suggestion is only valuable if the brake track groove was never present if it is somehow not a conclusive indication.
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Old 09-05-18, 04:25 PM
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If you want to go high tech buy a UT meter
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Old 09-05-18, 04:43 PM
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Originally Posted by coffeesnob View Post
If you want to go high tech buy a UT meter
https://www.amazon.com/Estone-Digita.../dp/B00GSM9IHU

$78, I would have though more expensive than that but minimum of 1.2mm might be problematic... Nonetheless, that groove will suffice for those wheels
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