Shimano Cassette question

Joel said:

Is it possible to buy a 30 tooth cog to fit an Ultegra 9 speed
cassette?
If so, can I take a 12-27 cassette, add the 30 tooth cog, remove the
12, ending up with a 13-30 cassette?

Thanks

http://harriscyclery.net/site/itemdetails.cfm?ID=702

Joel said:

Is it possible to buy a 30 tooth cog to fit an Ultegra 9 speed
cassette?
If so, can I take a 12-27 cassette, add the 30 tooth cog, remove the
12, ending up with a 13-30 cassette?

Thanks

You'll need a 13T endcog to replace the stock 13 with separate spacer
(which can go between the 30 and the cassette).
--
---
Marten Gerritsen

INFOapestaartjeM-GINEERINGpuntNL
www.m-gineering.nl

But where can I buy a 30T cog and 13T end cog?

m-gineering said:

Joel said:

Is it possible to buy a 30 tooth cog to fit an Ultegra 9 speed
cassette?
If so, can I take a 12-27 cassette, add the 30 tooth cog, remove the
12, ending up with a 13-30 cassette?

Thanks

You'll need a 13T endcog to replace the stock 13 with separate spacer
(which can go between the 30 and the cassette).
--
---
Marten Gerritsen

INFOapestaartjeM-GINEERINGpuntNL
www.m-gineering.nl

Joel said:

But where can I buy a 30T cog and 13T end cog?

http://sheldonbrown.com/harris/k7.html#sprockets

Joel said:

Is it possible to buy a 30 tooth cog to fit an Ultegra 9 speed
cassette?
If so, can I take a 12-27 cassette, add the 30 tooth cog, remove the
12, ending up with a 13-30 cassette?

Thanks

You can buy the cogs, with difficulty. Finding a loose 30t is
difficult. I've used a 32 and it works great. I don't know if 13t
cogs with the integral spacer are now avaialbe from Shimano USA. They
used to not be. A 13t first cog from an 8sp cassette works ok too.

Sheldon Brown sells the entire thing you are looking for.