Sitta Aluminium Rear Sprocket Triumph Street Triple 765 S / R / RS / Moto2 & Daytona 765 Moto2 (2017-2026) – 37-48 Teeth, 520 Pitch (201U)

When lap times and power delivery matter most, drivetrain weight is the enemy. The Sitta 201U aluminium rear sprocket strips unsprung and rotating mass to the bone — tipping the scales at just 350 g in size 45 — so every watt from the Street Triple 765's triple-cylinder engine reaches the tarmac with the minimum of inertia in the way. Engineered for 520 pitch and available in tooth counts from 37 to 48, this sprocket lets you dial in exactly the gearing your circuit or road riding demands.

Key Features

• Ultralight aluminium construction weighing just 350 g (size 45), reducing rotating mass for sharper throttle response and faster acceleration out of corners.
• Full 520 pitch specification, optimised for performance and racing use with a compatible 520 chain conversion.
• Twelve tooth-count options from 37 to 48 teeth, giving you precise control over gearing for every scenario from short, tight circuits to open-road touring.
• Eight anodised colour options — including hard-anodised finish for superior durability over standard anodising — letting you personalise without compromising longevity.
• 6-bolt sprocket carrier interface at 106/125 mm for straightforward, rattle-free fitment with no modification required.
• Manufactured to close tolerances for accurate chain alignment and reduced wear across the entire drivetrain.

Race-Ready Gearing — Why It Matters on Track

Gearing is one of the fastest, cheapest performance modifications available to any track-day rider or racer. The Sitta 201U puts that tuning capability in your hands through its broad tooth-count range.

A smaller rear sprocket in the 37-to-42-tooth range shortens overall gearing, raising top speed and easing engine revs on high-speed circuits or motorway sections. A larger sprocket in the 43-to-48-tooth range lengthens the gearing ratio, sharpening initial acceleration and improving agility through tight, technical sections — ideal for shorter, more technical circuits or urban sporting use.

With eight sizes available across those extremes, you can build multiple sprocket-and-map combinations and swap them between events without any specialist tooling.

Build Quality & Finish Options

The 201U is machined from high-grade aluminium alloy and then surface-treated in your choice of eight colours: silver, black, hard-anodised, red, gold, blue, orange, and green. The hard-anodised option is worth noting specifically — the process penetrates deeper into the aluminium surface than standard anodising, producing a significantly harder, more wear-resistant finish that extends service life under the demanding conditions of chain-driven power delivery.

Note: The product images show sprockets that are visually similar to the 201U model but do not represent it exactly.

Fitment & Compatibility

The Sitta 201U is precision-engineered for the following Triumph models fitted with the 520-pitch chain specification:

• Triumph Street Triple 765 S (2017 – 2026)
• Triumph Street Triple 765 R (2017 – 2026)
• Triumph Street Triple 765 RS (2017 – 2026)
• Triumph Street Triple 765 Moto2 (2017 – 2026)
• Triumph Daytona 765 Moto2 (2017 – 2026)

Compatible with 520 pitch chains only. Sprocket carrier interface: 106/125 mm, 6-bolt.

Specifications