Bentley R-Type Chassis Info

The chassis number for these models is composed of an initial fixed letter B followed by a number from 1 to 600. Lastly two letters, the first of which determines the series of the model.

The chassis number can typically be found on the firewall.

Back to R Type Parts

Release Date	Chassis Number	Modification Detail	introduced at Chassis:
Jun 1952 - Apr 1953	B2RT to B120RT	Revised luggage boot, automatic SU carburetors, revised attitude rear springs, revised rear shock damper linkage, two speed windscreen wiper, pop-out cigar lighter, separately housed main fuse, caster angle wedges	B2RT
Sep 1952 - Apr 1953	B1RS to B121RS	Corrugated bottom water hose connection	B68RT
Sep 1952 - May 1953	B2SR to B500SR	Taper roller bearings on rear axle pinion (except 12/41 axle)	B380SR
Jan 1953 - May 1953	B1SP to B501SP	Front shock dampers	B61SP
		Parco lubrized tappets	B425SP
		Taper roller bearings on rear axle pinion 12/41 axle	B433SP
Apr 1953 - Sep 1953	B1TO to B401TO	6.75 compression ratio cylinder head	B93TO
Jun 1953 - Dec 1953	B2TN to B600TN	Deletion of non-opposed springs in side steering tube	B313TO
		All welded frames	B349TO
		Metal facia, cable operated hot and cold, de-mister and underseat heater	B2TN
		Hard clay gasket	B373TN
		Deletion of reduced friction modification on steering connections	B390TN
		Revised throttle controls for synchromesh gearbox	B436TN
Oct 1953 - Dec 1953	B1UL to B251UL	Aluminium flywheel housing	B35UL
Nov 1953 - May 1954	B2UM to B250UM	Improved type underseat seat tool tray	B66UM
		Introduction of B-VI type gearbox tie rod	B212UM
Jan 1954 - May 1954	B2WH to B300WH	Flywheel inertia ring on cars with auto gearbox	B236WH
Mar 1954 - Jun 1954	B1WG to B301WG	Dynamo type mounting strap onstarter motor	B270WH
		Thicker 3rd motion shaft thrust washer	B89WG
		Compensator pipe between front and rear servo	B183WG
May 1954 - Jul 1954	B2XF to B140XF	Strengthened jaws on front brake operating links	B60XF
Jun 1954 - Oct 1954	B1YA to B331YA	12/41 rear axle (all cars)	B1YA
Aug 1954 - Nov 1954	B2YD to B330YD	Elimination of chromium-plated servo pressure plate	B123YD
		Long stroke starter pinion	B138YD
		Flexibox seal on water pump	B246YD
		Bentley continental type de-misting	B246YD
Oct 1954 - Jan 1955	B1ZX to B251ZX	Improved cold starting device	B1ZX
Dec 1954 - Feb 1955	B2ZY to B250ZY	2nd speed start	B73ZX
		Ferodo washers and drain slots in crankshaft vibration damper	B212ZY