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PostPosted: Sun Apr 29, 2012 7:24 pm 
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Joined: Wed Jan 07, 2009 3:15 pm
Posts: 24
need new cassette , current cassette is dura ace 7900 with 4 largest cogs being ti . what is the difference between the 7900 10 sp cassette and the 7800 10 speed cassette which also uses ti cogs I believe ? I'm using the kmc 10 sp xl chain.


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PostPosted: Mon Apr 30, 2012 3:24 am 
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Joined: Tue Apr 06, 2010 1:36 am
Posts: 37
I'm interested by this too. I currently use the 7800 and would like to know if it's worth paying the extra for 7900. The rest of my groupset is 7900 and I use a KMC X10SL chain.


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Posted: Mon Apr 30, 2012 3:24 am 


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PostPosted: Mon Apr 30, 2012 5:05 am 
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Joined: Sat Jun 13, 2009 4:02 am
Posts: 1955
Location: NoVA/DC
7900 has a little more machining. most evident when looking at the back of the spider. also available in a greater range of sizes (11-25, 11-27, 11-28, etc)


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PostPosted: Mon Apr 30, 2012 9:43 am 
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Joined: Sun Feb 05, 2012 7:00 am
Posts: 46
Location: Gold Coast, AUS
7900 Product page

7800 Product page

Looks like about 10g weight difference for the 11-23, 7800 cassettes that start with 11t only have 3 Ti cogs, & the 7900 has more size options.


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PostPosted: Mon Apr 30, 2012 12:42 pm 
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Joined: Wed Jan 07, 2009 3:15 pm
Posts: 24
thanks all for the replies , I've been using the 7800 and it shifted very well until it and the chain wore , bought a new kmc chain and was hoping it would shift ok with out changing the cassette but tis not the case ., the 4 ti gears are worn and the shifting is slugish there , after reviewing the product page I think I will buy a new 7800 ,it's 10 gr more but 40.00 less .thanks all for helping me with this question . cheers


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Posted: Mon Apr 30, 2012 12:42 pm 


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PostPosted: Mon Apr 30, 2012 5:31 pm 
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Joined: Wed Jan 07, 2009 3:15 pm
Posts: 24
thanks for the produce page post ozdavo , helped a lot . cheers


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