Join Date: Jun 2011
Location: Sunnyvale, California
Bikes: Bridgestone RB-1, 600, T700, MB-6 w/ Dirt Drops, MB-Zip, Bianchi Limited, Nashbar Hounder
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It should be 22.2mm (7/8"). But I thought Dimension primarily makes only theadLESS fork steerer for the disc brake hybrid 700c fork. I've only seen 1 inch threaded with cantilever posts. It should fit a road quill stem but that's not what we did for my wife's bike. After my last experience trying to thread a spanking new Tange Prestige fork w/ 1 inch steerer, I wore out the Park FTS-1 24 tpi cutting die and had to spend more money to buy a new one. For her bike, I got a 1 inch low-end threadless headset and got a shim for the 1 inch steerer above the headset. The shim is slotted so when clamped, it compresses and grabs the steerer really tight. Then standard 1 1/8th inch stems, washers, etc. just fit (except for the star nut which is for 1 inch steerers). But that makes for much easier tuning and adjustment than a threaded headset or quill stem. I adjust everything practically with a single 5mm allen key. No 6 mm allen, then dual 32mm headset wrench, or worrying about exact spacer height and insufficient threads on the headset lock ring, etc.