Bike Forums - stem size

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darksmaster923

12-25-07 12:43 AM

stem size

how do you tell if your stem is 1 inch or 1 1/8 inches?

stapfam

12-25-07 02:23 AM

to save mistakes- take it off and take to the LBS.

Retro Grouch

12-25-07 06:04 AM

Threaded or threadless?

If it's the threaded kind measure the shank of the stem where it enters the fork. A 1" stem will actually measure 22.2mm because it has to be a little smaller than 1" to fit inside the tubeing.

If it's threadless, remove the top cap and measure the stem's inside diameter. As long as you keep the clamp bolts tight doing this won't affect your bike's headset preload.

JanMM

12-25-07 10:50 AM

To measure bike things accurately, you'll need vernier calipers, which measure inside or outside diameters. Really cheap plastic ones are available and suitable.

Retro Grouch

12-25-07 03:47 PM

Quote:

Originally Posted by JanMM (Post 5867038)

To measure bike things accurately, you'll need vernier calipers, which measure inside or outside diameters. Really cheap plastic ones are available and suitable.

Yeah, but you don't need fancy equipment to measure for a stem. The choices are 1" or 1 1/8". That's within the "eyeball" range.

In a pinch you can clamp an adjustible wrench loosely around the stem shank and measure the distance between the jaws.

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