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PostPosted: Fri Aug 16, 2013 10:25 am 
Dirt Disciple

Joined: Thu Sep 02, 2010 4:03 pm
Posts: 22
As per the title.

My roadbike is running an 8 speed shimano setup (mixture in fact of dura ace, 600, 105). The rear derailleur is shimano 600.

The front chainwheels are 53 and 39.

My current cassette is 13-23 which is fine for most purposes (and I like the fact that the spacing between gears isn't too big) but I'd like to go up to a, say, 28 tooth cog as the lowest gear- for the hills.

I can see 11-28 cassettes out there but in an ideal world I see no reason to have a higher top gear- the existing 13 is fine for me. A 13-28 or 14-28 sounds ideal, but they don't seem to be standard stock. I guess that the rear derailleur is going to struggle with anything much bigger than 28?

Should I just go with an 11-28 or is there anything out there that would do? Whaddya think?


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PostPosted: Fri Aug 16, 2013 1:17 pm 
Retro Guru

Joined: Tue Feb 23, 2010 1:56 pm
Posts: 1032
Location: West Yorkshire
You could do what I've done with Campag cassettes, buy the 11-28 and mix and match with your existing one.

Mark.


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PostPosted: Fri Aug 16, 2013 1:20 pm 
Retro Guru
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Joined: Wed Apr 25, 2012 2:08 pm
Posts: 2186
Location: Shrewsbury
I don't think you'll get away with anything bigger than 28, some 600 RDs can only cope with 26. It depends which model derailleur you've got. The specs can be checked out here: http://www.velobase.com/


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PostPosted: Fri Aug 16, 2013 3:29 pm 
Dirt Disciple

Joined: Thu Sep 02, 2010 4:03 pm
Posts: 22
Thanks for that. It looks to be an RD-6401 which says it can take up to 28.

What are the tell tale signs of a worn cassette? I don't want to mix and match if the old cassettes is too worn although it looks, to my untutored eye, in pretty good condition.


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PostPosted: Sat Aug 17, 2013 7:08 am 
Road Moderator
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Joined: Thu Jun 18, 2009 1:07 pm
Posts: 4715
Location: Sheppey, Kent
There is a tool for checking cassettes although I've never seen one in the flesh or seen one in use....

It can be very difficult to tell. Personally I'd get the new cassette and combine with your old to get the ideal combo fit a new chain and you'll soon see if the sprockets are worn as the gears will play up, if they're not then they won't.

Miche also make shimano compatible cassette and SRAM are compatible too, although they ranges will probably be similar anyway but worth looking into perhaps


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PostPosted: Sat Aug 17, 2013 9:03 am 
retrobike rider
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Joined: Fri Aug 08, 2008 2:36 pm
Posts: 16747
Location: Yorkshire, England
Could shrink the front ring/rings or go triple as an alternative.
Best if both worlds then, nice close ratios and an extra ring for when it gets steeper.


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