Assertion: derailer gear | /r/HasProperty | a 15% difference
Facets:
value: roughly
type: DEGREE
Source sentences:
text: One standard option for the Brompton folding bicycle is to use a 3-speed hub gear (roughly a 30% difference between gear ratios) in combination with a 2-speed deraileur gear (roughly a 15% difference) to give 6 distinct gear ratios; this is an example of half-step gearing.