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11-34t megarange cassette, Shimano vs SRAM

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11-34t megarange cassette, Shimano vs SRAM

Old 08-04-17, 07:15 PM
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11-34t megarange cassette, Shimano vs SRAM

Hi I have an old Dahon Speed TR that came with a SRAM Dual Drive and a Shimano 11-32T 8-spd cassette. I'm going to change the front chainring, so I thought I might as well change the cassette and chain.

I was wondering if the megarange cassette with 11-34T would work?
Would there be any problems with shifting on the 34T cog? Clearance?

I noticed on Sheldonbrown that the 11-32t range on the Shimano is 11-13-15-18-21-24-28-32 while the SRAM is 11-12-14-16-18-21-26-32. The difference is the SRAM is spaced closer at the upper gears and farther at the lower gears, which seems better for me, as I'm usually on the 13-15-18-21 gears.

Will there be shifting problems if I switched to the SRAM cassette? The shifter is SRAM.

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Old 08-04-17, 09:05 PM
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What rd are you using? Anyway i think 34t should work. Just 2 additional teeth.

Not sure if SRAM would work, but i believe there should be enough play in your pulleys that 8 speed cassette from different brand would work. My bike with Alivio rd medium cage came with DNP 11-21, then i changed it to Sunrace 11-32, then i changed it to Sunshine 12-32. All work perfectly without adjustment and even changing between wheelsets.
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Old 08-05-17, 10:39 AM
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Mega range is a 24 to 34t jump, I like 24, 28 or 29, then the 34t cog combinations..

I cannot predict future performance of your purchases in advance.
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Old 08-05-17, 06:29 PM
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The 8 speed 11-34 Shimano offering is the only cassette I have ever thrown away before wearing it out.

Sunrace offers up a much better looking 12-34 and 12-32. 12-14-16-18-21-24-28-34(2)

I did a 2700ft to 7800ft over 26mile climb on both cassettes. The 26-34 jump is just too big when trying to find a comfort zone while on a brutal climb.
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Old 08-06-17, 11:06 PM
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I have the original SRAM X7 rd (2004?) that came with the Dual Drive II 24 (2009?). The 2002 manual says Dual Drive II 27 / 24 both use short 75mm derailleur cage, although the Dual Drive II 27 says max 34T and the Dual Drive II 24 says max 32T. This might just be the cassette that comes with the set.

Not really sure if 34T would fit. But Maybe?

I had a look at the difference between:
SRAM 11-32T (11, 12, 14, 16, 18, 21, 26, 32) x 39T chainring
Sunrace 12-34T (12, 14, 16, 18, 21, 24, 28, 34) x 42T chainring

The SRAM seems to have an extra step at the low and high end with more uniformity, but with more complicated shifting at the low end.
I can't seem to attach my gear in table.
I drew the gear switching order in the link below.


Last edited by tomtomtom123; 08-06-17 at 11:11 PM.
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Old 08-07-17, 09:05 AM
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Do it right...

Shimano Zee RD, 11-36T XT 10-speed cogset, Zee/SLX/XT shifters. Smooth, quick, reliable shifting. Like clockwork.

Look here.
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Old 08-07-17, 11:03 AM
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With dual drive I would not jump to a 34 from a 32. You don't need it. Another chance to make something that works well not work as well.

SRAM and Shimano cassettes 10--9---8 speed are all interchangeable with SRAM and have the same spacing between the gears. 10 to 10 and 9 to 9 and 8 to 8....

This is not true with 11 speed shimano road ---11 speed shim mtn---11 speed sram mtn.
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