Topic
Reference guides to bicycle and e-bike parts, standards, geometry and compatibility.
What the CPSC bicycle helmet standard tests: impact, retention, roll-off and field of vision, how to read the compliance label, and when to replace a helmet.
A freewheel is a threaded block with its own ratchet, a cassette is bare sprockets, and a freehub is the hub ratchet body. Here is why they don't swap.
Trek counts rider, bike and gear in one limit; Momentum lists rider and luggage separately. See how the figures differ and how to work out your own.
Since October 1, 2026, Spanish cyclists need a helmet outside built-up areas. Under-16s and working riders need one on every road. Who is covered.
Yes, if the stripe is a continuous ring on both wheels: StVZO § 67 accepts it instead of spoke reflectors. What counts, what stays required, import checks.
In France, riders and passengers must wear a CE-marked high-visibility vest outside built-up areas at night or in poor visibility. Here is what qualifies.
Salsa excludes internal rust on steel frames and Kona excludes corrosion, per terms read in October 2026. What that means and when rust means stop riding.
Austria treats an e-bike as a bicycle up to 250 W rated continuous power and 25 km/h design speed unless it is class L1e-B. The 1 Oct 2026 e-moped line.
A German pedelec to 25 km/h is a bicycle; an S-Pedelec to 45 km/h needs a plate, class AM licence and helmet, and stays off bike paths.
How bicycle disc brakes work, hydraulic versus cable systems, rotor sizes, mounting standards, fluid warnings and when to stop riding.
Read ETRTO tire markings, match bead seat diameter, and check tire width against rim inner width with Schwalbe's ETRTO chart, plus hookless rules.
How rear hubs lock and coast: freewheel vs freehub, pawls vs ratchet rings, what engagement points mean, and when to stop and see a shop.