Cassette options?

winrya

Just picked up a cube peleton pro which is running a compact with 10 speed 12-28 tiagra CS-4600 cassette with tiagra 4600 rear derailler.

I would like a bit more speed than the 50/12 gives me, it seems at 40mph an 11 tooth will give me an extra 3-4 mph at the same cadence. Will a 105 10 speed CS-5700 cassette fit? A bit of searching suggests it will but one site states ;

NOTE: CS-6700 11-28T requires the use of RD-5700, RD-6700 or RD-7900 (just noticed its talking about the ultegra version but attached to the 5700 so could just be a typo)?

Any one know my options, will it work and if it does will any gear adjustment be needed with such a small swap?

Cheers,

Ryan

mamba80

You can fit any 10 Shimano cassette with a 11t with out any adjustment.
Or you just increase your cadence?
If your chain is in any way worn you ll need a new chain to match the new cassette

ugo.santalucia

In fairness, I doubt you can push 43 mph... That's Chris Hoy kind of speed

winrya

Cheers guys. Bike is only 2 rides old so no issues with chain wear. Just want the extra few mph for the descents. Quite hilly round by me and have passed 45mph a few times, hopefully it will give me enough to break 50mph:)

ugo.santalucia

winrya wrote:

Cheers guys. Bike is only 2 rides old so no issues with chain wear. Just want the extra few mph for the descents. Quite hilly round by me and have passed 45mph a few times, hopefully it will give me enough to break 50mph:)

When you pass 40 mph you can even stop pedalling...

JamesB

Quite hilly round by me and have passed 45mph a few times, hopefully it will give me enough to break 50mph:)

what`s the point though? you compromise the whole gear selection for the odd rare occasion of downhill faster

It`s hilly around me too, a nice 1 km 8% nearby, sometimes I get near 50, mostly 45 mph down it but it is very dependent on wind direction. A good aero tuck IMO will get the extra speed, always remembering the X roads at bottom followed by narrow bridge

winrya

JamesB wrote:

Quite hilly round by me and have passed 45mph a few times, hopefully it will give me enough to break 50mph:)

what`s the point though? you compromise the whole gear selection for the odd rare occasion of downhill faster

It`s hilly around me too, a nice 1 km 8% nearby, sometimes I get near 50, mostly 45 mph down it but it is very dependent on wind direction. A good aero tuck IMO will get the extra speed, always remembering the X roads at bottom followed by narrow bridge

I just keep finding myself going for an extra gear all the time (any slight descent) and without swapping to a standard double at the front, this will help a little for a £30 outlay. I'm not too concerned about compromising the gear selection really, is there that much noticeable difference between an 11-28 and a 12-28 apart from the 11t gear?

ugo.santalucia

winrya wrote:

JamesB wrote:

Quite hilly round by me and have passed 45mph a few times, hopefully it will give me enough to break 50mph:)

what`s the point though? you compromise the whole gear selection for the odd rare occasion of downhill faster

It`s hilly around me too, a nice 1 km 8% nearby, sometimes I get near 50, mostly 45 mph down it but it is very dependent on wind direction. A good aero tuck IMO will get the extra speed, always remembering the X roads at bottom followed by narrow bridge

I just keep finding myself going for an extra gear all the time (any slight descent) and without swapping to a standard double at the front, this will help a little for a £30 outlay. I'm not too concerned about compromising the gear selection really, is there that much noticeable difference between an 11-28 and a 12-28 apart from the 11t gear?

You must be a powerhouse... I don't think my 12 T sprocket has ever been in contact with the chain, unless when indexing the gears

JamesB

is there that much noticeable difference between an 11-28 and a 12-28 apart from the 11t gear?

http://www.gear-calculator.com/# will help you decide

seems you lose the 16t, so if you`re pedalling at 25 mph 100rpm there`s quite a jump up or down

AND you`d have to be spinning at 140 rpm + to get 50 mph even with a 50 /11 top, that is some cadence indeed to be stable at

ugo.santalucia

JamesB wrote:

AND you`d have to be spinning at 140 rpm + to get 50 mph even with a 50 /11 top, that is some cadence indeed to be stable at

You need to put small weights in some spots on the shorts to balance your legs..

winrya

Some great info cheers guys. I'm actually 3 rides new to road biking. I'm a mountain biker who's sick of the constant messing around to just do a bit of exercise. I'm gonna stop doing the mundane rides I do on my full Susser just for fitness and use the road bike to improve fitness and save the mountain bike for the routes I love - snowdon, longmynd, Brenin and peaks etc.

My legs are pretty strong, what I'm short of at the moment is the fitness to keep pedalling constantly as its all bursts of speed on the mountain bike. Really loving it though, can see my 10 rides a month dropping to just a couple of good ones with lots of road riding in between:) done 70 mile in 3 rides though, amazed how easy the distance clocks up!

JamesB

would pretty well agree with you on all this ; I`m turning away from MTB to some extent too, it is so good to put in a couple hours on road and clock up 30 -35 miles, and bike usually isn`t too mucky cf after MTB.

Good steady road riding pays dividends, as you indicate MTB is often max HR or downhills !!

Getting 5 000 miles / year done on a road bike is a good feeling, you`d be lucky to achieve a quarter that on a MTB only

But I really wouldn`t bother with the 11 t change ............unless you get into road racing

Eich

Ah! from MTB - long cranks and gear mashing power
You'd probably be used to lots of 2 tooth gaps too. If you're training for that sort of riding then the 11 makes sense. However if you get bitten by the road bug you will most likely develop a fondness for close spacings and smooth spinning.

winrya

The smoothness of the gear ratios was one of the first things I noticed. Also the fact that the transmission shifts so beautifully compared to my mtb cables covered in dirt and grime. Its such a pleasure to pop up and down the gears with a satisfying instant change into each and every gear.

rolf_f

ugo.santalucia wrote:

winrya wrote:

Cheers guys. Bike is only 2 rides old so no issues with chain wear. Just want the extra few mph for the descents. Quite hilly round by me and have passed 45mph a few times, hopefully it will give me enough to break 50mph:)

When you pass 40 mph you can even stop pedalling...

+1. If you can find a hill that will give you 50mph, you'll have stopped pedalling long before that point.

FWIW, I've made 50 a couple of times and one of those I was on my Dawes Tourer with a max gear of 48-12. On a bike, the 5 mph between 45 and 50 is a hell of a long way!

pilot_pete

I have 50-12 top gear and have no trouble hitting 40+ downhill. You will find an aero tuck will gain more than 3mph on a steep downhill. I hit 55mph in the Algarve last November. The last thing you want to be thinking about above about 45mph is trying to pedal! Forget the 11t and practice your tuck.

PP

wakou

If you do buy a new cassette, PM me, I might buy the 12-28