Changing components
I now live in a very hilly area and want to change to an easier set up.
My question is can I go to a 50/34 with a 11/30 cassette without changing anything else? Also would I need a new chain and if so, would the 6701 be the one I need.
Thanks in advance
Comments
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the short (SS) derailleur might struggle with a 30T cog, but lots of people get away with it.
Unless your chain is nearly new it’s a good idea to change the chain if you change the cassette. Use any 10s road chain (the cheaper tiagra ones are fine).1 -
you'll need a new crankset as the compact is a 110BCD and you have a 130 unless you can track down some compact 130s.
Fibrelyte do these or go on the bay of e..The camera down the willy isn't anything like as bad as it sounds.
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Assuming you are staying with 10sp Ultegra 6700 series, then as above you need to track down a FC-6750 compact 50/34 crankset. The smallest inner you can fit to your 130 BCD double crankset is a 38T.
Regarding the cassette you have the choice of a CS-6700 11-28T if your RD is the RD-6700 or a CS-6700 12-30T if your RD is the RD-6700-A. You can identify the RD-6700-A by the 30T stamped into the upper outer derailleur pulley cage, adjacent to the upper guide wheel.
You could also use a Tiagra CS-4600 12-30T if you can find one. There was no CS-6700 11-30T that is an 11sp series cassette.
Chain, yes Shimano CN-6701, CN-5701 or CN-4601. if you want a chain with a quick link, KMC, SRAM and Connex all do 10sp.0 -
https://forum.bikeradar.com/discussion/13117885/shimano-105-chainset-50-34-and-rotor-q-rings#latest
buy this and use this. just as good as Ultegra..The camera down the willy isn't anything like as bad as it sounds.
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Some people also say that if you use oversized pulley wheels you can use a bigger cassette than normal but i've never tried this so not sure if it works but for a few quid off the 'bay/alibaba its worth a punt..
The camera down the willy isn't anything like as bad as it sounds.
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Surely that would make things worse?MattFalle said:Some people also say that if you use oversized pulley wheels you can use a bigger cassette than normal but i've never tried this so not sure if it works but for a few quid off the 'bay/alibaba its worth a punt.
Shimano are quite conservative with their gear ranges. If it were me I'd try a 30t with existing rear derailleur before buying.
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Agree - I've slung a 2 tooth bigger than recommended cassette on a shortcage mech before and it was only small/small where you had an issue, so deffo worth a pop.
re pulley wheels: dunno. never tried it, never needed to..The camera down the willy isn't anything like as bad as it sounds.
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If you wanted to do it on the cheap, you could buy a 9 speed MTB derailleur https://merlincycles.com/shimano-alivio-m3100-rear-derailleur-9-speed-242834.html
This way you could keep using the existing crankset and get a larger 12-34(36) cassette.1 -
or one of those wolf's tooth thingies.
The camera down the willy isn't anything like as bad as it sounds.
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I have never tried it but as I see it, bigger jockey wheels will increase chain wrap ( the amount of slack chain that the rear mech can take up ) but will reduce the size of the biggest rear cog you can use. Lack of chain wrap is not a problem. A sagging chain in small front and small rear cog does not matter because you do not need to use that. So the idea ( IMHO) that fitting bigger jockey wheels will help the OP is nonsense.First.Aspect said:
Surely that would make things worse?MattFalle said:Some people also say that if you use oversized pulley wheels you can use a bigger cassette than normal but i've never tried this so not sure if it works but for a few quid off the 'bay/alibaba its worth a punt.
Shimano are quite conservative with their gear ranges. If it were me I'd try a 30t with existing rear derailleur before buying.0 -
agree completely. its a daft idea. bigger jockey wheels. tchaaa..
The camera down the willy isn't anything like as bad as it sounds.
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Thank you. Regarding the FC6750, you say compact, mine at the moment is a double, would this make any difference to what you have suggested?dj58 said:Assuming you are staying with 10sp Ultegra 6700 series, then as above you need to track down a FC-6750 compact 50/34 crankset. The smallest inner you can fit to your 130 BCD double crankset is a 38T.
Regarding the cassette you have the choice of a CS-6700 11-28T if your RD is the RD-6700 or a CS-6700 12-30T if your RD is the RD-6700-A. You can identify the RD-6700-A by the 30T stamped into the upper outer derailleur pulley cage, adjacent to the upper guide wheel.
You could also use a Tiagra CS-4600 12-30T if you can find one. There was no CS-6700 11-30T that is an 11sp series cassette.
Chain, yes Shimano CN-6701, CN-5701 or CN-4601. if you want a chain with a quick link, KMC, SRAM and Connex all do 10sp.0 -
Hello, Your FC-6700 crankset is a standard double, the FC-6750 is a compact double 50/34T as opposed to the FC-6703 which is a triple. There are also super compacts like the GRX 2X 46/30T 48/31T, these would not work with your existing STI and FD-6700, according to the Shimano compatibility chart. My bike uses a FC-6750 50/34T, RD-6700-A and CS-4600 12-30T.0
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Brilliant thank you. I dont know anything about compatability. Would I be able to put 105 crankset and cassette on the 6700 groupset. The 6750 seems to be like gold dust. Just to keep my options open if I cannot get the 6750dj58 said:Hello, Your FC-6700 crankset is a standard double, the FC-6750 is a compact double 50/34T as opposed to the FC-6703 which is a triple. There are also super compacts like the GRX 2X 46/30T 48/31T, these would not work with your existing STI and FD-6700, according to the Shimano compatibility chart. My bike uses a FC-6750 50/34T, RD-6700-A and CS-4600 12-30T.
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Hello,
If you cannot locate a good SH 6750 you can use another Shimano HOLLOWTECH II compact double, so yes 10sp105 FC-5750, FC-4650, 4700, also there are people on this forum who have successfully used 11sp double compact cranksets Ultegra FC-6800 and 105 FC-5800 with an otherwise 10sp transmission. Not sure if anyone has used the latest Ultegra FC-R8000 or the 105 FC-R7000 they may also be a possibility.
There are also Shimano Non Series compact double cranksets FC-R565, FC-RS500, FC-RS510. Yes you can use a 105 CS-5700 cassette.
Useful documentation in PDF format here https://si.shimano.com/#/0 -
A compact chainset is 50 x 34 and is a double like your 53 x 39 chainset.
Getting rid of drafts.0