Brand: Shimano

Model/Series: Altus A10 RD-AT10 long cage rear derailleur from Shimano's early Altus mountain bike component line.

Item: Bolt-on rear derailleur for multi-speed mountain, hybrid, or touring bicycle drivetrains.

Materials and color: Silver-finished aluminum alloy body with black-painted alloy link, steel cage plates and hardware, and black plastic pulley wheels and bumper covers.

Design details: Long cage layout for wide-range gearing, cable-operated parallelogram mechanism with barrel adjuster, Centeron guide pulley, and bolt-on mounting to a standard rear derailleur hanger.

Markings and logos: Outer body carries a SHIMANO ALTUS A10 logo decal; inner link is stamped RD-AT10 SHIMANO JAPAN VIA; upper pulley is molded with SHIMANO CENTERON G-PULLEY branding.

Country of origin and era: Made in Japan as part of Shimano's Altus A10 mountain bike component family from the early 1990s.

Actual Measurements: Weight 10.8 oz per digital scale, derailleur only without packaging.

Compatibility: Intended for multi-speed mountain, trekking, or hybrid bicycles that use a bolt-on rear derailleur hanger and Shimano-compatible shifters; verify tooth capacity and indexing with your specific chainring and freewheel or cassette combination.

Includes: One Shimano Altus A10 RD-AT10 long cage rear derailleur only; no cable, housing, shifters, derailleur hanger, or original packaging are included.