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Quality shims

Old 04-19-16, 02:43 PM
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Quality shims

The clamp for the adjustable stoker stem on our tandem was bottoming out, and a reasonable tug on the bars would make it slip. I smiled, remembering a book read many years ago...last time I used that trick was 14 years ago.. @Black wallnut may remember...

First, mix up a nice vodka tonic. Save the tonic water can.





Yes, I know, it's not official Campagnolo shim stock...but it works.
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Old 04-19-16, 03:50 PM
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'at there is some pree-cision craftmanship. Ya done it agin, mah friend.

I've done this a couple times on seat posts, but I always buried deep enough so you couldn't see it, unless you were peeping at the back slot on the seat cluster. It worked Ok.
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Old 04-19-16, 04:07 PM
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@gugie we'll have to call you a master shim maker henceforth! Well done.
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Old 04-19-16, 04:12 PM
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Been there, done that: https://www.bikeforums.net/classic-vi...-shim-diy.html Are you planning to trim the excess? Something, eventually, will tug on the exposed edge and lead to a sharp corner, which is guaranteed to poke your stoker's eye out!
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Old 04-19-16, 04:26 PM
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Originally Posted by gugie View Post
The clamp for the adjustable stoker stem on our tandem was bottoming out, and a reasonable tug on the bars would make it slip. I smiled, remembering a book read many years ago...snip . . .
It's a great book; funny how the bit about the shim stays in your memory for so long.
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Old 04-19-16, 04:27 PM
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That shim is going to fail in short order. You need to use a craft-brewed beer can, not a crummy Trader Joe's tonic water can, to make your shims.
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Old 04-19-16, 06:05 PM
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Having BTDT many times over, I've switched to using strips cut out of plastic water bottles. It just works better for me. Easier to install and less slippage.
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Old 04-19-16, 06:08 PM
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I'm looking for a shim to fit a Nitto B115 (25.4) bar to a Cinelli stem (26.4).
I assume this has to be .5 mm thick. I have two layers of Yuengling in there, to no avail.
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Old 04-19-16, 10:38 PM
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Originally Posted by Black wallnut View Post
@gugie we'll have to call you a master shim maker henceforth! Well done.
With our cross-connection from the old BT3Central site, you're the first person I thought of!

Originally Posted by gaucho777 View Post
Been there, done that: https://www.bikeforums.net/classic-vi...-shim-diy.html Are you planning to trim the excess? Something, eventually, will tug on the exposed edge and lead to a sharp corner, which is guaranteed to poke your stoker's eye out!
No trimming, the shim was cut to appropriate width, picture taken with shim stuck out for effect.

Originally Posted by bikemig View Post
It's a great book; funny how the bit about the shim stays in your memory for so long.
That and the definition of quality: it's hard to measure, and everyone knows it when they see it. Or something like that.

Originally Posted by davester View Post
That shim is going to fail in short order. You need to use a craft-brewed beer can, not a crummy Trader Joe's tonic water can, to make your shims.
The aluminium doesn't know any better. That and I like my brews out of bottles, and glass doesn't make for very good shims.

Originally Posted by seedsbelize View Post
Having BTDT many times over, I've switched to using strips cut out of plastic water bottles. It just works better for me. Easier to install and less slippage.
In the PNW, our water quality is not questioned, bottling water doesn't make much sense, and the neighbors look at you funny when they see the recycle bin full of plastic water bottles. South of San Diego, the ol' Montezuma's Revenge is a real concern.

But there ain't no slippage here. Maybe it's just a zen thing.
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Old 04-20-16, 07:09 AM
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Originally Posted by RobbieTunes View Post
I'm looking for a shim to fit a Nitto B115 (25.4) bar to a Cinelli stem (26.4).
I assume this has to be .5 mm thick. I have two layers of Yuengling in there, to no avail.
No offense to the OP, but I think that looks like crap. Sorry, Gugie.

Robbie, I have a full compliment of brass shim stock. Lemme see if I have the correct thickness, and will send you a piece.
Then you can trim it yourself so it doesn't show. Got some aviation snips?
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Old 04-20-16, 08:43 AM
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Originally Posted by RobbieTunes View Post
I'm looking for a shim to fit a Nitto B115 (25.4) bar to a Cinelli stem (26.4).
I assume this has to be .5 mm thick. I have two layers of Yuengling in there, to no avail.
The walls of aluminum cans are thinner than one might think -- typically a little over 0.1 mm -- so you'd probably need four or five layers of beer can shim. That is, if you were willing to use that many layers of shim. Personally, I'd pick up some 0.5 mm shim stock at that point.
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Old 04-20-16, 09:18 AM
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Machined shims from Problem Solvers, a division of Quality Bike Products .. Problem Solvers
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Old 04-20-16, 09:42 AM
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Hobby shops often sell sheets of brass and aluminum that come in varying thickness for a couple bucks. I use it for making models never thought until now that it's also perfect for shim stock.
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Old 04-20-16, 12:00 PM
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Originally Posted by SkyDog75 View Post
The walls of aluminum cans are thinner than one might think -- typically a little over 0.1 mm -- so you'd probably need four or five layers of beer can shim. That is, if you were willing to use that many layers of shim. Personally, I'd pick up some 0.5 mm shim stock at that point.
This is the best way so you have the ends butt without overlap. Overlapping can cause a stress riser if not positioned correctly.
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Old 04-20-16, 01:07 PM
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Originally Posted by rootboy View Post
No offense to the OP, but I think that looks like crap. Sorry, Gugie.
Originally Posted by gugie View Post
No trimming, the shim was cut to appropriate width, picture taken with shim stuck out for effect.
You can't see the shim after I finished the job, I intentionally made it stick out so you could see it in the photo.
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Old 04-20-16, 01:19 PM
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Originally Posted by davester View Post
That shim is going to fail in short order. You need to use a craft-brewed beer can, not a crummy Trader Joe's tonic water can, to make your shims.
I can't speak for Trader Joe's but Diet Coke shims last years. My Mooney is on perhaps its third since 1995. (I replace them when I pull the seatpost.) Lubricating the work with the water/caffeine solution of the Diet Coke may lead to a more accurate cut than using water/alcohol for the same purpose.

Ben
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Old 04-20-16, 01:31 PM
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Don't know about his drink concoction's, but often done the same shim-ano as gugie.

I've found any bar to stem w/ shim used in rotational force will eventually slip. Nitto, Cinelli... especially with the Pearl and Oyster stems.

For linear and vertical forces as in a seatpost, shims work.

As for Robbie's do-dat Cinelli 26.4, I wouldn't bother. For the Cinelli bar, I would match it to a proper size stem only.
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Old 04-20-16, 02:57 PM
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Any machinist could set you up with shims in many different sizes.
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Old 04-20-16, 04:28 PM
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Originally Posted by gugie View Post
You can't see the shim after I finished the job, I intentionally made it stick out so you could see it in the photo.
Oh shoot then. Sorry man. I was wondering why you would leave it like that.
I sold ya short.
My badly, as they say.
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Old 04-20-16, 04:34 PM
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Originally Posted by rootboy View Post
Oh shoot then. Sorry man. I was wondering why you would leave it like that.
I sold ya short.
My badly, as they say.
No problem, for a while I thought you were commenting on that mugly Cannondale adjustable stem. Not the prettiest thing in the world, but the price was right at the local co-op. One of the two tightening bolt threads was stripped, so I had to nut up, as they say.

The easy solution for ugly bits on a tandem is to put a cute girl on the back.
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