Changing Cassettes
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Changing Cassettes
Postby pez2014 » Fri Aug 15, 2014 9:04 pm
So my question is will this work ok and any other advice would be appreciated.
Cheers Pez.
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Re: Changing Cassettes
Postby KGB » Fri Aug 15, 2014 9:12 pm
You could also consider a compact crank or at least a smaller inside chainring if possible.
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Re: Changing Cassettes
Postby Derny Driver » Fri Aug 15, 2014 9:14 pm
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.
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Re: Changing Cassettes
Postby pez2014 » Fri Aug 15, 2014 9:54 pm
Thanks for the help.
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Re: Changing Cassettes
Postby DarrylH » Fri Aug 15, 2014 10:07 pm
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.
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Re: Changing Cassettes
Postby pez2014 » Fri Aug 15, 2014 10:13 pm
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 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.
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Re: Changing Cassettes
Postby DarrylH » Fri Aug 15, 2014 10:20 pm
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Re: Changing Cassettes
Postby Homo Suburbiensis » Fri Aug 15, 2014 10:21 pm
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.
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Re: Changing Cassettes
Postby pez2014 » Fri Aug 15, 2014 10:32 pm
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Re: Changing Cassettes
Postby nezumi » Fri Aug 15, 2014 11:28 pm
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.
2015 Merida Scultura 5000
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Re: Changing Cassettes
Postby Xplora » Fri Aug 15, 2014 11:48 pm
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.
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Re: Changing Cassettes
Postby pez2014 » Sat Aug 16, 2014 6:52 am
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Re: Changing Cassettes
Postby Duck! » Sat Aug 16, 2014 10:41 am
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Re: Changing Cassettes
Postby AP81 » Sat Aug 16, 2014 11:59 am
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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Re: Changing Cassettes
Postby Duck! » Sat Aug 16, 2014 12:23 pm
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).
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Re: Changing Cassettes
Postby DarrylH » Sat Aug 16, 2014 3:40 pm
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.
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Re: Changing Cassettes
Postby AP81 » Sat Aug 16, 2014 4:12 pm
Thanks. I suspected it was a GS as the cage looks marginally longer.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).
Cheers
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