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Cst4 RB

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Cst4 RB

Postby lou » Wed May 20, 2026 12:32 am

Any one running a cst4 on a RB , what gear ratio can it pull ….Thinking of 4.46

Any info be helpful.
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Re: Cst4 RB

Postby nsaints » Thu May 21, 2026 2:59 pm

As no one has replied I'll chip in

1st off I know nothing about RB kits

Other than they come in different capacities - suggest you give some more details of your setup here to receive advise from someone best placed

However, that said, there is some suggested gear ratio's on AF's gear chart here (link below)
CST4 isn't mentioned so you'd need to translate a CST4 to one of the listed exhausts
4.46 is no where close to the suggested ratios, so I'd have alarm bells ringing 4.46 is appropriate

https://www.afrayspeed.co.uk/media/other/53342287/45-tooth-gear-chart1..pdf
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Re: Cst4 RB

Postby Storkfoot » Thu May 21, 2026 4:23 pm

Image

It’s designed for the lower end of the rev range but I have no experience of it.
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