SRAM, sturmey hub
SRAM, sturmey hub
On a three speed hub with 8 cassette body, what is the hub ratios from the middle gear? I think it is 24% down and 33% up but memory is fading on that.
Re: SRAM, sturmey hub
25% down and 33% up is the usual for a 3sp. Direct drive for 2nd.
This one's mine.
https://www.sturmey-archer.com/en/produ ... rf3-silver
This one's mine.
https://www.sturmey-archer.com/en/produ ... rf3-silver
Mick F. Cornwall
Re: SRAM, sturmey hub
Gear steps of 33% and 33% is quoted on the spec.Mick F wrote: ↑3 Feb 2023, 4:05pm 25% down and 33% up is the usual for a 3sp. Direct drive for 2nd.
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https://www.sturmey-archer.com/en/produ ... rf3-silver
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Re: SRAM, sturmey hub
25% down and 33% up from middle (2nd) is the same as 33% up from bottom (1st) and then 33% up again to top (3rd).brumster wrote: ↑3 Feb 2023, 6:59pmGear steps of 33% and 33% is quoted on the spec.Mick F wrote: ↑3 Feb 2023, 4:05pm 25% down and 33% up is the usual for a 3sp. Direct drive for 2nd.
This one's mine.
https://www.sturmey-archer.com/en/produ ... rf3-silver
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Re: SRAM, sturmey hub
That's for an AW or SRF3. There are vintage SA hubs with different ratios but you won't see many.
The SRAM 3-speed has a very slightly wider ratio than 33% but you are unlikely to notice much difference when riding.
The SRAM 3-speed has a very slightly wider ratio than 33% but you are unlikely to notice much difference when riding.
Re: SRAM, sturmey hub
brumster wrote: ↑3 Feb 2023, 6:59pmGear steps of 33% and 33% is quoted on the spec.Mick F wrote: ↑3 Feb 2023, 4:05pm 25% down and 33% up is the usual for a 3sp. Direct drive for 2nd.
This one's mine.
https://www.sturmey-archer.com/en/produ ... rf3-silver
Mick F. Cornwall
Re: SRAM, sturmey hub
Mick F wrote: ↑4 Feb 2023, 6:42pmScreenshot 2023-02-04 at 18.41.41.pngbrumster wrote: ↑3 Feb 2023, 6:59pmThat's me told then ! Thanks for explaining.Mick F wrote: ↑3 Feb 2023, 4:05pm 25% down and 33% up is the usual for a 3sp. Direct drive for 2nd.
This one's mine.
https://www.sturmey-archer.com/en/produ ... rf3-silver
Gear steps of 33% and 33% is quoted on the spec.
Re: SRAM, sturmey hub
I’m fine now. Thanks for all the replies.