Changing Cassettes

pez2014
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Changing Cassettes

Postby pez2014 » Fri Aug 15, 2014 9:04 pm

Hi. I bought a Cell Lapa 2.0 and the cassette is a Tiagra 11-25. I really struggle on even a smallish hill ( I have Fibromyalgia) and a friend recommends I change the cassette to Shimano's CS-4600 and buy the 12-30T cassette.
So my question is will this work ok and any other advice would be appreciated.

Cheers Pez.

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KGB
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Re: Changing Cassettes

Postby KGB » Fri Aug 15, 2014 9:12 pm

The 30t should just fit with a standard derailleur. 28t will work for sure, even according to shimano but I've read of several people using the 30 without problems.
You could also consider a compact crank or at least a smaller inside chainring if possible.
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Derny Driver
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Re: Changing Cassettes

Postby Derny Driver » Fri Aug 15, 2014 9:14 pm

I know a 12-29 works...just. The 29 is mighty close to the derailleur but clears it. Not sure about a 30.
Plenty of Tiagra 12-28 for sale on Eeebay. I think you'd find 28 makes a massive difference.
Id go for 28 unless someone can confirm that a 30 clears the derailleur.
My 29 is a custom Miche job.

pez2014
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Re: Changing Cassettes

Postby pez2014 » Fri Aug 15, 2014 9:54 pm

Ok. Thanks for that. As I said the Cassette on there is a Tiagra, would the CS-5700 105 Fit. 11-28.

Thanks for the help.

DarrylH
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Re: Changing Cassettes

Postby DarrylH » Fri Aug 15, 2014 10:07 pm

That bike already has compact cranks. Shimano 105 (5700) is rated for 30t. My 105 equipped Trek came fitted with a Tiagra 12-30 as standard so it should not give you any problems.
For those interested full specs are on page 120 of 2012-2013_specifications shimano.pdf. This totally disagrees with what is on Shimanos web page. The latest 105 (11sp) is good for 32T.

pez2014
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Re: Changing Cassettes

Postby pez2014 » Fri Aug 15, 2014 10:13 pm

DarrylH wrote:That bike already has compact cranks. Shimano 105 (5700) is rated for 30t. My 105 equipped Trek came fitted with a Tiagra 12-30 as standard so it should not give you any problems.
For those interested full specs are on page 120 of 2012-2013_specifications shimano.pdf. This totally disagrees with what is on Shimanos web page. The latest 105 (11sp) is good for 32T.
Ok Darryl. In your opinion what would you recommend Tiagra 12-30 or the 105 11 28. As long as the 105 is compatible. This is all new to me lol.

DarrylH
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Re: Changing Cassettes

Postby DarrylH » Fri Aug 15, 2014 10:20 pm

If your legs are like mine go for the 12-30. Any of the Shimano will fit, the only difference is price and a little bit of quality. I have been using Tiagra, 105 and Ultegra on my Trek.

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Re: Changing Cassettes

Postby Homo Suburbiensis » Fri Aug 15, 2014 10:21 pm

I am pretty sure the 5700 rd was updated so that the max rear sprocket is 30T. So it should work. I don't know how to tell if you have the updated one though as even though they are denoted as shimano 105 5701 I am not sure whether this is indicated anywhere on the derailleur. If it does work you may need a new chain (your current one might be too short) and this will be about $20 online. If you prepared to do a bit of online reading/youtube watching and have/buy the necessary tools then you can do all the stuff yourself.

edit: If you take a look at all retailers they list the max as 30T. For example this : http://www.this link is broken.au/shimano-105-rd ... illeur-ss/" onclick="window.open(this.href);return false;
and this: http://www.this link is broken/au/e ... -prod85966" onclick="window.open(this.href);return false;
both say 30T. Since your bike is 2014 you most likely can put the 12-30 cassette on but it might be good to check with cell first.

pez2014
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Re: Changing Cassettes

Postby pez2014 » Fri Aug 15, 2014 10:32 pm

Thanks a lot been a great help. I did 60K today my longest by far, struggled on the hills (more like speed humps) but I got there and managed an average speed of 19 kph, never going to be sprinter or KOM but I was happy lol

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Re: Changing Cassettes

Postby nezumi » Fri Aug 15, 2014 11:28 pm

I can confirm that a 105 5700 rear deraileur will accomodate a 30 tooth rear cassette - I am a lazy bugger and have one on my cyclocross bike.

As far as cross-compatability, any Shimano 10 speed road cassette will be OK on your bike. If you have fibro I would favour the 12-30, as you will benefit more from having the larger toothed big ring than the small toothed little ring. If you don't have the tools to fit it yourself (chain whip and casette tool) you *may* be better off having the shop fit the cassette. If you plan to buy online and take it in for fitting, ask what the labour cost is likely to be. You don't want all the money you save buying online to be spent in labour - may as well just buy from the shop, no waiting for delivery or hassle.
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Re: Changing Cassettes

Postby Xplora » Fri Aug 15, 2014 11:48 pm

Fantastic effort pez.

I would "tend" to recommend you take a concrete pill and harden up, because that is the quickest way to climb those hills faster, but given your condition (I don't need to look it up to guess it is going to make riding HARD) then you will be best served with a 12-30, which will definitely fit on your bike. The 11 sprocket is for sprinting downhills. Focus on getting up the hills safely with the massive cassette, and use the flats to build your fitness. You might never be able to move beyond a 34/30 bottom gear but you can expect that you will get faster while riding 50/17 over time. I've climbed 5-8% with 36/30 and 45kgs on the back (towing kids). You should be able to survive anything with a 30t. You will not miss the 11 that much for a while.

pez2014
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Re: Changing Cassettes

Postby pez2014 » Sat Aug 16, 2014 6:52 am

Thanks for that people been a great help.

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Duck!
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Re: Changing Cassettes

Postby Duck! » Sat Aug 16, 2014 10:41 am

5700 105 rear derailleurs got a mid-model tweak to increase max. sprocket capability. 2011-12 "original spec" maxed out at 28T, 2013-14 are able to fit a 30T.If your frame is blessed with a comparitively long derailleur hanger you can get away with a cassette outside the official spec. Conversely if you have a frame with a short hanger, you can get clearance issues even within spec.
I had a thought, but it got run over as it crossed my mind.

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Re: Changing Cassettes

Postby AP81 » Sat Aug 16, 2014 11:59 am

Piggy-backing on this thread...hope you don't mind...

I have a 5701 rear derailleur with a 12-30 cassette (2013 secteur expert disc). I can't see any markings to differentiate whether it is a SS (short cage) or GS (medium cage), but I want to switch to a 12-25 cassette, as I find the gap from 15 to 17 rather annoying. Anyone know how to tell whether it is an SS or a GS? I'm pretty sure it wouldn't really matter, but I'd be interested to know either way.
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Duck!
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Re: Changing Cassettes

Postby Duck! » Sat Aug 16, 2014 12:23 pm

There isn't any marking to identify which type; typically the cage length itself is a pretty obvious visual guide. If the 12-30 is stock fitment then the derailleur is probably GS, as there's that bit extra allowance for chain wrap to cover the wide gear range, especially if it's a compact up front (SS will handle the 30 sprocket, but preferably only with "traditional" rings, as there's less difference between the two).

As far as swapping in the tighter cassette, no drama at all, the upper body of the derailleur is the same for both types (upper body length determines big sprocket clearance, cage length determines how big a gear range can be used by its chain-wrapping/slack-absorbing capacity).
I had a thought, but it got run over as it crossed my mind.

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Re: Changing Cassettes

Postby DarrylH » Sat Aug 16, 2014 3:40 pm

SS is rated for low gear sprocket 25min-30T max with double crankset (compact or traditional)
GS is rated for low gear sprocket 27min-32T max with double crankset or 25-30T with triple crankset.
This is not a guess but is from Shimano specifications.
My Trek was sitting in the showroom in late 2011 though I didn't buy it until Jan 2012 and the RD is marked 30T on the cage, so I suspect the transition was early 2011. The Shimano specs are available for download for anyone who has any doubts.

AP81
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Re: Changing Cassettes

Postby AP81 » Sat Aug 16, 2014 4:12 pm

Duck! wrote:There isn't any marking to identify which type; typically the cage length itself is a pretty obvious visual guide. If the 12-30 is stock fitment then the derailleur is probably GS, as there's that bit extra allowance for chain wrap to cover the wide gear range, especially if it's a compact up front (SS will handle the 30 sprocket, but preferably only with "traditional" rings, as there's less difference between the two).

As far as swapping in the tighter cassette, no drama at all, the upper body of the derailleur is the same for both types (upper body length determines big sprocket clearance, cage length determines how big a gear range can be used by its chain-wrapping/slack-absorbing capacity).
Thanks. I suspected it was a GS as the cage looks marginally longer.

Cheers
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