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Replacing rear cassette question

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Replacing rear cassette question

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Old 10-15-15, 06:16 PM
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columbia1spring
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Replacing rear cassette question

I have shimano 105 derailleur, and I am running a tiagra 12-28. CS 4600... I am living in an area with no hills what so ever and never use the larger gears. I am looking to replace the cassette with a Ultegra CS 6700 11-25. I am thinking that with a smaller cassette it will go on without issue? I have a mid compact up front. I can easily just buy a replacement 12-28, but I want to give the 11-25 a try.
I have either a short or medium derailer, I am sure it's not a long cage. I am running a CN 6701 shimano chain.
We are talking all 10 speed here!!!
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Old 10-15-15, 06:32 PM
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No problem.
There's a small chance you will need to micro adjust the rear derailleur cable if the new casstte is a tiny bit inboard or outboard compared to the old one.

You may also be able to buy a larger inner chainring to get a bit bigger gearing.
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Old 10-15-15, 06:34 PM
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Sure, it will work no problem. Might need a minor tweak of the rear derailleur adjuster.
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Old 10-15-15, 06:36 PM
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It's an easy swap. Just make sure to put the spacer on the backside of the cassette (2 spacers total if it's a mavic hub or an 11 spd hub).
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Old 10-15-15, 07:42 PM
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Originally Posted by Le Mechanic View Post
It's an easy swap. Just make sure to put the spacer on the backside of the cassette (2 spacers total if it's a mavic hub or an 11 spd hub).
I am running Mavic open Pro and did the install myself when I bought the wheels. I know there is only 1 spacer now on the backside with the Tiagra cassette. Let me ask, because I just don't know.... if the new cassette installs and needs a second spacer will I know that because the cassette will have some play side to side?
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Old 10-15-15, 07:52 PM
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Originally Posted by columbia1spring View Post
I am running Mavic open Pro and did the install myself when I bought the wheels. I know there is only 1 spacer now on the backside with the Tiagra cassette. Let me ask, because I just don't know.... if the new cassette installs and needs a second spacer will I know that because the cassette will have some play side to side?
If your running an Open Pro, your not running a Mavic wheel, just a wheel with a Mavic rim.

You haven't given any details about the wheel you are using, other than it's not a factory wheel, indicated by the rim used, so by going by what you have given, if you currently have a 1mm spacer with a 4600 cassette, you will need exactly the same spec spacer (either the same one, or the new cassette will be supplied with on) to use with the 6700 cassette.
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Old 10-15-15, 08:16 PM
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Originally Posted by jimc101 View Post
If your running an Open Pro, your not running a Mavic wheel, just a wheel with a Mavic rim.

You haven't given any details about the wheel you are using, other than it's not a factory wheel, indicated by the rim used, so by going by what you have given, if you currently have a 1mm spacer with a 4600 cassette, you will need exactly the same spec spacer (either the same one, or the new cassette will be supplied with on) to use with the 6700 cassette.
Correct advice.

A common mistake when swapping cassettes is not noticing the spacer is there and installing another cassette without it, but it sounds like you're aware of it. It should be the same as you currently have it spacer wise.
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