13 products
18" Frame Bikes
Buying guide
18 inch frame bikes, explained
An 18 inch frame is a classic medium adult size. This page lists adult bikes by frame size, not children's bikes with 18 inch wheels. Current stock is mostly Boss and Claud Butler bikes at reduced prices.
Sizing
As a rough guide an 18 inch frame suits riders around 170 to 180cm (5ft 7in to 5ft 11in). Inside leg is the better measure, so check each bike's size chart.
Looking for a kids bike?
If you meant a bike with 18 inch wheels for a child, see our 18 inch wheel bikes collection instead.
Not sure on size?
Measure your inside leg in socks against a wall, then compare it with our frame size chart or try the Bike Finder for a quick match.
Free UK delivery on bikes
90-day returns · 12-month warranty
0% finance · Clearpay · Cycle2Work
Not sure which one's right?
Answer four quick questions and our Bike Finder will match you to the perfect ride from this range.