Chains vs. Tire Valves
Comparing 2 standards across 19 specifications. 19 key differences identified.
Bicycle roller chains are standardized under ANSI B29.1 and ISO 9633. Across all modern bicycles, the chain pitch (distance between consecutive pin centers) is strictly 1/2 in (12.7 mm). Drivetrain speeds (1-speed to 13-speed) differ in internal roller width (1/8" for single-speed down to 11/128" for 11/12/13-speed) and external pin length (tapering from 8.6 mm on 1-speed to 5.25 mm on 12-speed chains).
Bicycle inner tubes and tubeless systems utilize three primary valve standards: Presta (Sclaverand / French valve; 6 mm stem diameter, manual locknut tip, rated up to 15 bar / 220 psi), Schrader (American / Auto valve; 8 mm stem diameter, spring-loaded central pin, ISO 4570 thread, 0.305"-32 TPI), and Dunlop (Woods / English valve; 8 mm stem diameter, drop-in core).
Specification Comparison Table
19 Parameters| Parameter / Spec | ||
|---|---|---|
|
Chain Pitch (All Speeds)
|
12.70 mm (0.500 in / 1/2 in pin-to-pin pitch universal) | — |
|
Single-Speed (1s / BMX / Track) Inner Width
|
3.18 mm (1/8 in / 0.125 in roller width) | — |
|
Single-Speed External Pin Length
|
8.60–9.40 mm | — |
|
6/7/8-Speed Inner Width
|
2.38 mm (3/32 in / 0.0938 in roller width) | — |
|
6/7/8-Speed External Pin Length
|
7.10–7.30 mm | — |
|
9-Speed External Pin Length
|
6.50–6.70 mm | — |
|
10-Speed External Pin Length
|
5.88–6.10 mm | — |
|
11-Speed External Pin Length
|
5.50–5.65 mm | — |
|
12-Speed External Pin Length (Shimano / SRAM)
|
5.15–5.30 mm (e.g. SRAM Flattop / Shimano HG+) | — |
|
Maximum Wear / Elongation Threshold
|
0.5–0.75 % elongation (replace at 0.5% on 11/12-speed to save cassette) | — |
|
Presta Valve Stem Diameter
|
— | 6.0 mm (0.236 in / narrow drilling for narrow road rims) |
|
Presta Operating Mechanism
|
— | External Threaded Locknut with captive brass plunger pin Manual Lock |
|
Presta Maximum Pressure
|
— | 15.0 bar (217.5 psi high-pressure road tolerance) |
|
Presta Rim Hole Requirement
|
— | 6.5 mm (0.256 in diameter hole in rim) |
|
Schrader Valve Stem Diameter
|
— | 8.0 mm (0.315 in / identical to automotive tire valves) |
|
Schrader Thread Specification
|
— | 0.305-32 UNEF (ISO 4570 8V1 thread) Standard |
|
Schrader Rim Hole Requirement
|
— | 8.5 mm (0.335 in diameter hole in rim) |
|
Dunlop (Woods) Stem Diameter
|
— | 8.0 mm (uses 8.5 mm rim hole, manual rubber sleeve / core) |
|
Common Valve Stem Lengths
|
— | 32, 40, 48, 60, 80 mm (extended for deep-section carbon aero rims) |