Glossary
61 bike terms every rental shop owner, mechanic and counter staffer should know.
The measurement of the bike frame, typically seat tube length, that determines customer fit. Sizes: XS, S, M, L, XL for most rentals; specific cm/inch measurements for premium bikes.
For rental shops: Most fit issues trace to wrong frame size. Measure or confirm at booking.
The distance from the ground to the top tube when the rider stands over the bike. Should allow 2–5cm of clearance for standard bikes, more for mountain bikes.
Horizontal distance from saddle to handlebar. Combined with stem length, determines how stretched or compact the riding position feels.
Vertical distance from bottom bracket to top of head tube. Higher stack = more upright position; lower stack = more aggressive.
Horizontal distance from head tube to seat tube. Combined with stem length, controls cockpit fit.
The angle of the seat tube relative to the ground. Steeper (73°+) puts the rider forward; slacker (70°) puts them back.
The angle of the head tube. Slack (66–69°) = stable at speed, good for mountain bikes; steep (71–73°) = quick handling, road bikes.
Distance between front and rear axles. Long wheelbase = stable; short wheelbase = maneuverable.
The complete drivetrain package: shifters, derailleurs, chain, cassette, chainrings. Shimano and SRAM dominate the market. Sora, Tiagra, 105, Ultegra, Dura-Ace are Shimano road tiers ascending.
The cluster of gears on the rear wheel hub. Counted by cog count (e.g., 11-speed = 11 gears in the cluster). Wears under chain load.
For rental shops: Replace with chain when chain wear exceeds 0.75%.
The toothed rings attached to the crank arms. Single (1x), double (2x), or triple (3x) depending on drivetrain.
The connecting loop between cassette and chainring. Wears faster than any other drivetrain component; replace at 0.75% stretch in rental use.
The mechanism that moves the chain between gears. Front derailleur on double/triple setups; rear derailleur on all geared bikes.
The small replaceable bracket that connects the rear derailleur to the frame. Designed to bend or break in a fall, protecting the frame.
The stretching of chain links over time. Measured as a percentage using a chain checker. 0.75% = replace; 1% = replace chain + cassette.
The wire that connects shifters to derailleurs. Stretches over time, requiring adjustment. Replace annually in rental use.
A brake system where pads squeeze against the wheel rim. Types: V-brake, caliper, cantilever. Simpler and cheaper than disc; wears the rim over time.
A brake system where pads squeeze against a rotor attached to the hub. Better in wet conditions, more consistent, more expensive. Mechanical (cable) or hydraulic (fluid).
The metal disc attached to the wheel hub on disc-brake bikes. 160mm and 180mm are common sizes. Replace when thickness is below manufacturer minimum.
The friction material that presses against rim or rotor. Two types: organic (resin) and sintered (metallic). Replace when material drops below 2mm (rim) or 1mm (disc).
For rental shops: Highest-wear component on rental bikes. Budget 2–4 replacements per bike per season.
The process of removing air from hydraulic brake lines to restore firm lever feel. Required after any line repair or when spongy lever develops.
Liquid in hydraulic brake systems. Mineral oil (Shimano) or DOT (SRAM, some others). NOT interchangeable; using wrong type destroys seals.
A tire/rim system that runs without an inner tube, sealed with liquid sealant. Reduces flats dramatically when maintained; requires periodic sealant refresh.
Liquid inside tubeless tires that seals small punctures automatically. Dries out in 2–4 months and needs refresh.
A traditional tire with a separate inner tube holding air. Simpler, cheaper, more flat-prone than tubeless.
Pounds per square inch, tire pressure unit. Road: 80–110; hybrid: 40–65; mountain: 25–35. Always within tire sidewall rated range.
The edge of the tire that seats into the rim. Wire beads (heavier, cheaper) vs folding beads (lighter, more expensive).
The outer rubber surface of the tire. Retire when worn flat on the centerline or sidewall shows cracks.
The tightness of spokes in a wheel. Even tension keeps wheels true and strong. Low or uneven tension causes wheels to go out of true under load.
Adjusting spoke tension to make the wheel spin without wobble. A wheel that wobbles side-to-side is out of true and needs truing.
The center of the wheel where spokes attach. Contains bearings that allow the wheel to spin. Bearing play or grinding indicates service needed.
Service bookings like a flat fix or a full tune sit in the same system, each with its status.
No credit card required. 21-day free trial.
Motor assistance activated by pedalling. Most common e-bike type. Assist levels (eco, tour, sport, turbo) control how much power the motor adds.
Hand-controlled power delivery without pedalling. More common on cruiser e-bikes; regulated or banned in some regions.
Battery capacity measurement. Higher Wh = longer range. 500Wh = mid-range; 750Wh+ = long-range touring.
Number of full charge/discharge events a battery has completed. 500–800 cycles is typical lifespan before capacity drops below 70%.
Electronics that protect the battery from overcharge, deep discharge, and overheating. BMS failure is a retirement event.
Measures how hard you pedal; motor scales assist proportionally. Produces natural-feel e-bikes. Premium tier.
Measures pedalling speed; motor delivers fixed assist regardless of effort. Simpler, cheaper. Entry tier.
Distance an e-bike can travel on a full charge. Highly variable, depends on terrain, rider weight, assist level, temperature. Rental shops should measure their fleet.
The steering component. Types: flat (mountain, hybrid), drop (road), riser (commuter), bullhorn, aero bars. Width and sweep affect fit.
Connects handlebar to fork. Length affects reach; angle affects stack. Adjustable stems exist for fine-tuning fit.
Controls the derailleurs. Integrated with brake levers (STI on road, combined on mountain) or separate.
Shimano's name for integrated brake-shifter on road bikes. Combines brake lever and shift lever in one unit.
The surface the rider holds. Grips on flat bars; bar tape on drop bars. Consumable, replace annually in rental use.
The bearing assembly in the head tube that allows the fork to rotate. Check for play by rocking the bike with front brake held.
The Air/Brakes/Chain pre-rental inspection. Standard 5-minute check before every rental. Catches most pre-ride mechanical issues.
A structured 10-minute check before handing the bike to a customer: saddle height, reach, handlebar angle, tire pressure. Reduces mid-rental returns.
The scheduled time or rental count between maintenance tasks. Drivetrain every 10–15 rentals, brakes every 30, full tune every 100.
A comprehensive bike service: clean drivetrain, adjust gears and brakes, true wheels, check bearings, lube components. Usually 60–90 minutes.
A staff-run ride after service or fit to confirm everything works before customer handoff. 5 minutes; catches issues static inspection misses.
A full fleet inventory review 3–4 weeks before opening. Counts, inspects, services, produces retirement and reorder lists.
A structured review after close deciding continue/sell/retire per bike based on wear data and inspection.
The pattern of moving bikes between active rental and service rotation. Prevents single-bike over-use while others sit idle.
A booking where the customer does not arrive and does not cancel. Typical rate 3–8% of bookings; recoverable 25–40% with fast follow-up.
Partial payment taken at booking. Reduces no-shows and covers cancellation losses. Typical 20–50% of total rental.
A pre-authorized hold on the customer's payment method to cover potential damage. Released automatically if return is clean.
A bike rental combined with a staff-led ride. Includes route, schedule, and capacity management. Different operational profile than self-guided rental.
A rental where the customer rides independently on their own route. Simpler operations than guided; requires clearer customer instructions.
A rental where the customer starts at one location and returns to another. Requires van shuttling of bikes, more complex than return-to-same-location.
A day when booking volume is 30%+ above baseline. Weekends, holidays, post-weather-improvement days. Requires extra staff and gear preparation.
Percentage of fleet actually rented over a period. 70%+ season utilization is healthy; peak-day should hit 95%+.
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