Figuring out what size spoke you need, what bearing fits your hub, or whether a cotter pin matches requires measuring small parts with precision—and calipers feel like overkill when you just need a quick answer. The Park Tool SBC-1 gives you a dedicated gauge for the three measurements that come up constantly in wheel and hub work. Flip through the stamped steel leaves to find the slot that fits your part, read the size, and you're done. No batteries, no calibration, no squinting at digital readouts.

The spoke gauge covers diameters from 1.5mm to 2.3mm in 0.1mm increments, which spans everything from ultralight bladed spokes through standard 14-gauge. For bearings, the gauge handles outside diameters from 7mm to 28mm—covering loose-ball and cartridge bearings found in headsets, bottom brackets, hubs, pedals, and jockey wheels. The cotter pin section measures shank diameters and helps match replacement pins to older three-piece cranks still in service on some utility and vintage bikes.

Each leaf has the measurement stamped directly into the metal, so readings stay legible even after years of shop use and greasy fingers. The fan-style arrangement lets you flip quickly between sizes, and the whole thing fits in a pocket or hangs on a pegboard hook. It's the kind of tool you grab when a customer brings in a wheel with a broken spoke and you need to know whether it's 1.8mm or 2.0mm before pulling stock from the parts bin.... Read More