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Correct drop bar size that will fit a quill stem?

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Correct drop bar size that will fit a quill stem?

Old 05-19-16, 07:22 PM
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CrystalBike
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Correct drop bar size that will fit a quill stem?

I bought a new Nitto Dynamic quill stem for my old road bike but the drop bar is to small and the quill stem will not tighten enough. How do i measure to make sure a new drop bar will fit my stem?
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Old 05-19-16, 07:55 PM
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Those stems come in either 26.0 mm or 25.4 mm, which refers to the diameter of the bar at the clamp. You probably have a 26.0 mm. If your bar is 25.4 mm, the stem will have trouble clamping tightly enough.

To measure, get some metric vernier calipers, from $10 on up, sold at most hardware stores including Home Depot type places. Or, your bars and the stem might be marked.

It is possible to use a thin metal shim to fit a 25.4 mm bar to a 26.0 mm stem. They cost about $10. Or you can make your own.

After you have installed the bar, test it - with both your hands, and all your body weight and strength, try to get the bar to slip in the clamp. I mean, practically do a handstand on the bars. It must not move even a tiny bit.
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Old 05-19-16, 07:58 PM
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Calipers, tape measure, ruler... but probably the easiest would be to check the receipt/invoice for the stem or it's packaging as you say you only just got this. You could also remove the stem, as it's this info is stamped on the quill.

All the information you need should also be stamped/printed on the handlebar, just make sure these match.
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Old 05-19-16, 08:17 PM
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One of these sizes should cover most stem/bar mismatch cases: Problem Solvers Handlebar Shim > Components > Handlebars > Misc. Handlebar Accessories | Jenson USA You will need to know/measure what you've got. Cheap calipers like those from Harbor Freight (often $10 on sale) will be very useful. Measuring diameters with a rule or tape won't work out well.
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Old 05-19-16, 09:05 PM
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Originally Posted by CrystalBike View Post
How do i measure to make sure a new drop bar will fit my stem?


6" Utility Caliper ...they used to sell them for two bucks.
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Old 05-19-16, 10:15 PM
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2-3 layers of aluminum beverage can should do the trick to shim a 25.4 mm handlebar in a 26.0 mm stem. I needed two layers to shim a 25.0 mm handlebar in a 25.4 stem. An aluminum pie plate or similar should work so long as it's not too thick. Or an aluminum lid for a bowl from Chipotle.
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Old 05-20-16, 07:21 PM
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Thanks guys, problem has been solved. Just ordered a new Nitto drop bar, cant wait for this build.
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Old 05-21-16, 10:48 AM
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Alternatively you could have purchased a pair of Problem Solvers brand shims for that handlebar. I recently bought a pair to work with an old slim handlebar to mount a new K-Edge bracket for my bike computer. They work great and cost $6 bucks and come in different sizes for various size conversions. And they look professional and like it was done right not a jerry-rigged setup:

Problem Solvers

Last edited by drlogik; 05-21-16 at 10:52 AM.
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Old 05-21-16, 11:10 AM
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Nitto themselves make a special shim set to put a 1"/25.4 bar in a 26.0 stem
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