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Author Topic: Types of BSA gearboxes RRT2, STD,STB,etc.  (Read 10210 times)

Offline dicky-yrrep

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Types of BSA gearboxes RRT2, STD,STB,etc.
« on: November 12, 2009, 09:58:26 PM »
Hi, can anyone give me some info on the various types of boxes and what they stand for? I have a Super Rocket and i have removed the box today, i thought the stamp read ST3 but after getting onto the bench it actually reads STB, What is the difference between this and a STD ? also some info on RRT2 etc would be great, I'm learning something about these great machines every day!
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Offline L.A.B.

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Re: Types of BSA gearboxes RRT2, STD,STB,etc.
« Reply #1 on: November 12, 2009, 10:21:02 PM »
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Offline L.A.B.

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Re: Types of BSA gearboxes RRT2, STD,STB,etc.
« Reply #2 on: November 12, 2009, 10:29:28 PM »
And, apparently, STB was a US model A10 Spitfire scrambler gearbox?
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Offline Goldie

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Re: Types of BSA gearboxes RRT2, STD,STB,etc.
« Reply #3 on: November 16, 2009, 10:39:27 PM »
A genuine RRT2 gearbox is a close ratio racing box with a very high first gear and has a reverse cam plate plunger which is situated on top of the gearbox and not below as the STD box.

If you live in a very hilly environment and the bike is for road use then I would not advise the RRT2, unless you have a very good clutch and be prepared to replace the plates on a regular basis depending on the amount of milage you do.
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