How Rimwize works

The catalogue

Rimwize is a side-by-side spec table for bicycle wheelsets. Catalogue rows start from published manufacturer figures. Community rows are submitted through Add a wheelset.

What the numbers mean

Internal Width

The distance between the bead seats, inside the rim. Wider internals support a more open tire casing — comfort and grip, with aero tradeoffs.

External width

Outside of the rim at the brake track / tire interface. Matters for how a tire sits in the airflow.

Depth

Bead seat to nipple bed. Mixed-depth sets list front / rear. Deeper is usually faster in a straight line and worse in gusts.

Hookless vs Hooked

Hookless rims omit the bead hook. They often run wider and need a compatible tire and a pressure cap. Do not mix casually.

Claimed Weight

Sticker weight from the brand, typically without tape or valves. Real pairs vary. If you weigh a set, put the scale reading in notes.

Scraping, later

Live scraping of brand sites is not running here. Manufacturer pages change, block bots, and often forbid reuse in their terms. A durable catalogue is: structured seed data, community forms, and if you go further, a polite, licensed ingest pipeline with robots.txt, rate limits, and a human review queue. The form is the honest source of new rows today.