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https://hayesbicycle.com/support
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Serial numbers for Reynolds Wheels are located in a few places depending on how your purchased your wheels.
Please note your front and rear wheels have unique serials.
1. Under the tubeless tape by the valve. These are long and start with the letter "H."
2. There may also be a white/black decal on the sidewall. Same as above. These are long and start with the letter "H."
3. If purchased after market and you have the original Reynolds shipping/wheel box these are also located on both sides of that. Look for a white label - you should see separate serials for the front and rear.
Serial numbers for suspension forks are found on the back of the crown and start with the letters "HB"
On rear shocks you'll find the serial number near or on the eyelets or ends. These start with "MC"
ProTaper components are not serialized. So you can enter some random characters in that field.
Sun Ringle components are not serialized. So you can enter some random characters in that field.
Hayes Disc Brake components have the serial number on the caliper. Dominion calipers start with "DM."