Which cassette for fast 9sp riding?

russboy

I use my bike on the road 99% of the time for the commute to work & noticed recently that when accelerating the chain is jumping.

I replaced the rear derailleur (and cable) to a Shimano XT M772 long cage as one of the jockey wheels teeth was worn out on the old derailleur, although it had done in excess of 3000 miles so had a good innings. Also recently replaced the chain due to the bad weather & have a 9 speed sram chain on there.

However the chain is still jumping after fitting the above.

The crankset was replaced back in Aug 2011 to Shimano Deore M590 with the larger 48.36.26 set up for higher top end speed.

So next step is to replace the cassette but which one to go for? Ideally I’d need something that’ll give a better top end speed, but probably wont make any real difference?

If that doesn’t fix it then new crankset is next but fairly sure a new cassette will sort it.

Cheers,

Russ

nicklouse

any 9spd one that has a 11T small cog so that is most of them.

russboy

nicklouse wrote:

any 9spd one that has a 11T small cog so that is most of them.

Cool, thanks.

cycleclinic

You could se a close ratio 9 speed cassette for road duties.

russboy

thecycleclinic wrote:

You could se a close ratio 9 speed cassette for road duties.

Thanks, can you point me in the right direction?

In respect of the 11T small cog mentioned I presume here:

http://www.chainreactioncycles.com/Mode ... odelID=443

Where it says "Each - 11-32" the 11 would refer to the small cog?

nicklouse

Russboy wrote:

thecycleclinic wrote:

You could se a close ratio 9 speed cassette for road duties.

Thanks, can you point me in the right direction?

In respect of the 11T small cog mentioned I presume here:

http://www.chainreactioncycles.com/Mode ... odelID=443

Where it says "Each - 11-32" the 11 would refer to the small cog?

correct.

russboy

Think i've answered my own question as this is a 11-25 setup, rather than the bulk standard 11-32:

http://www.wiggle.co.uk/shimano-hg50-9-speed-cassette/

Good price as well

EDIT - Then again it does say ◦For Super Narrow 9-speed HG chains so maybe not

nicklouse

Russboy wrote:

Think i've answered my own question as this is a 11-25 setup, rather than the bulk standard 11-32:

http://www.wiggle.co.uk/shimano-hg50-9-speed-cassette/

Good price as well

EDIT - Then again it does say ◦For Super Narrow 9-speed HG chains so maybe not

why? it will not give any greater top speed and will reduce the low gears.

do you want less range?

russboy

nicklouse wrote:

Russboy wrote:

Think i've answered my own question as this is a 11-25 setup, rather than the bulk standard 11-32:

http://www.wiggle.co.uk/shimano-hg50-9-speed-cassette/

Good price as well

EDIT - Then again it does say ◦For Super Narrow 9-speed HG chains so maybe not

why? it will not give any greater top speed and will reduce the low gears.

do you want less range?

The impression I was given was that the smaller the 9th cog the easier it would be to generate speed, although its all relative to how fast you can pedal of course.

Less range? Not sure really, I only use the bike for my commute, although I live up on Epsom Downs & work in Epsom town centre so it’s all uphill on the way home, but it’s only 3 miles each way so not exactly a major trek!

There are of course so many options out there:

http://www.chainreactioncycles.com/Mode ... odelID=443
http://www.chainreactioncycles.com/Mode ... delID=5045
http://www.chainreactioncycles.com/Mode ... elID=31059
http://www.chainreactioncycles.com/Mode ... elID=27680
http://www.chainreactioncycles.com/Mode ... elID=57562
http://www.wiggle.co.uk/shimano-deore-h ... -cassette/
http://www.wiggle.co.uk/shimano-hg50-9-speed-cassette/
http://www.wiggle.co.uk/sram-pg950-9-speed-cassette/
http://www.wiggle.co.uk/shimano-hg61-9- ... -cassette/
http://www.wiggle.co.uk/shimano-hg80-9-speed-cassette/

........... and more besides!

The Rookie

Smallest sprocket you can fit on the rear with a conventional freehub is an 11T which most MTB cassettes have as top gear already (Road cassettes often go only to a 12 or occasionally a 13T).

You sure you are using the right cadence? At 120rpm with 48:11 you should be doing 40mph (depending on tyre size), I run a 46:11 combo on my commuter and only rarely use top gear and only when I'm doing circa 35mph plus and have topped out at over 45mph (yes that was spinning a bit fast!)

russboy

The Beginner wrote:

Smallest sprocket you can fit on the rear with a conventional freehub is an 11T which most MTB cassettes have as top gear already (Road cassettes often go only to a 12 or occasionally a 13T).

You sure you are using the right cadence? At 120rpm with 48:11 you should be doing 40mph (depending on tyre size), I run a 46:11 combo on my commuter and only rarely use top gear and only when I'm doing circa 35mph plus and have topped out at over 45mph (yes that was spinning a bit fast!)

So on the basis of this stick with the 11t a the smallest & then the question is what do I go up to on the largest, bearing in mind I hardly use it at the moment.

Having had a quick look at the bike in the shed at work it starts at 34t, then to 30t, 26t, 23t, 20t, 17t …………. & then it’s too covered in gunk for me to see!

Yeah I’ve had plus 40mph downhill, in fact did hit 45mph when pedalling like a loon once on my route into work.

nicklouse

Russboy wrote:

EDIT - Then again it does say ◦For Super Narrow 9-speed HG chains so maybe not

9spd is 9spd is 9spd

russboy

nicklouse wrote:

Russboy wrote:

EDIT - Then again it does say ◦For Super Narrow 9-speed HG chains so maybe not

9spd is 9spd is 9spd

Ahhh, prob just maketing gumph then to make you buy a new chain at the same time. Makes sense as otherwise your crankset wouldnt be compatiable either.

The Rookie

Russboy wrote:

Yeah I’ve had plus 40mph downhill, in fact did hit 45mph when pedalling like a loon once on my route into work.

Sounds like your gearing is Ok then, certainly doesn't need to be any longer geared!

russboy

The Beginner wrote:

Russboy wrote:

Yeah I’ve had plus 40mph downhill, in fact did hit 45mph when pedalling like a loon once on my route into work.

Sounds like your gearing is Ok then, certainly doesn't need to be any longer geared!

Lol, fair point!

May just go for the cheapest option then, sound reasonable?

The Rookie

Perfectly reasonable, although better ones are lighter, that may not be critical to you.

Just for comparison, I run a 46T single up front with an 11-26 out back which give me just enough spread of gears for my commute, my 11-26 Deore is lighter than my 11-34 XT (on my MTB) and running single ring up front saves about 1/4Kg off the bike - more than offset by the 1+Kg food in the lunchbox and the 3+Kg of laptop though!