7 speed cassette

[busdennis]

my current 7 speed cassette ranges from 11 to 28 but can you buy a cassette where the gear range is more compact say 11 12 13 14 16 18 20 for example

 

[4F]

Theres a 13 - 21 here http://www.sjscycles.co.uk/shimano-hg70-7-speed-cassette-prod299/

Ratio:
- 13 / 14 / 15 / 16 / 17 / 19 / 21

 

[busdennis]

been trying a few local TT before i join a club, not sure if im 50 or 52 up front but im consistantly changing from 11 to 13 and back again on the rear so i could do with a 11 12 13 combo then what ever

 

[ohnovino]

According to Sheldon there are no Shimano-compatible 7-speeds with 11,12,13,...

The closest is probably the 12,13,14,15,17,19,21

 

[sidevalve]

Would it not be possible to combine two differing cassettes into one to suit youself ?

 

[curzons246]

I've got a Shimano Hyperglide 7 speed 12,13,14,15,17,19,21 very little use, it came on my Dyna Tech but was no good for Derbyshire hills - any good to you?

 

[RecordAceFromNew]

Get one of these and if necessary something else to make one up to your heart's content*.

* e,g, two from their standard offerings of CSR63 7AP and CSR63 7BP would give you nearly exactly what you asked for, and if you shop around you might not even need to get them from oz / abroad

 

[busdennis]

Would it not be possible to combine two differing cassettes into one to suit youself ?

that is the next question i was going to ask?

 

[albion]

As above, you can have HG 50 in 12-21 or strangely 13-23 or 13-26 only.

Consider moving to 8 speed.

 

[RecordAceFromNew]

Shimano 7 speed freehubs are not wide enough to take 8 speed cassettes.

 

[fossyant]

Ps you are pedalling at an average cadence of between 80 and 100 ? Why are you in the 13 so much.

 

[busdennis]

hi all
dont want more gears, just some lower gears
and i dont want to be in 13, its just that im not fit enough yet to do the full course in 11 and i have no 12thats why im looking for a combination with 11 and 12 (but i dont think a combination of 52 front and 13 rear is too shabby for a beginer anyway)

 

[albion]

Obviously you have to buy 12-21 and change the front chainwheel if you want that high ratio kept, possibly the same for 8 speed.

I suspect 11T is not ideal and so for mountain bikes with small chainwheels.

 

[RecordAceFromNew]

I suspect 11T is not ideal and so for mountain bikes with small chainwheels.

All else being equal, imho most people who can should get a cassette starting from 11T. The reasons are here.

 

[albion]

I meant to manufacturer but that is probably 10T. I also recall reading that 11T is less efficient than 12T due to power transfer problems on smaller sprockets.
Maybe it is manufacturers 'moving us on' with 8 speed and less now designated for leisure riders.

I slightly recall my old 8 speed cassettes had a cluster of something like 5 with the smallest 3 a separate piece.
My new ones have a cluster of 7 with only the 11T being a separate piece.

Historically old style 7 speed freewheels started at 13. 12T is rarer and 8 speed deemed problematic.