The length of the cable (or chain, in models of the corresponding type — see above), provided for in the design of the lock.
The longer the cable / chain, the more places will be available for fastening the bike and the easier it will be to lock other parts besides the frame (primarily the wheels). The most modest indicators in modern bicycle locks are about 500 – 600 mm — these are the simplest models, including for children's bikes. In general, a cable lock with a length of less than 1000 mm is considered short, up to 1500 mm — medium, and in the most advanced models this figure can reach 2500 – 3000 mm. But heavier
chain locks are made, respectively, shorter, among them a figure of 1500 mm or more is already considered advanced. Well, anyway, it is worth remembering that the reverse side of a large length is an increase in weight and dimensions in the folded position.
