Anyone used the 11 - 34 10 speed cassette yet?

I pull a trailer with my touring bike for camping and kayaking the 11-27 ultegra just doesnt cut it
I found 11-32 and 11-34 10 speed cassettes from IRC @$139
Any idea how these work?
Same rear derailler?, of course I would increase chain length to 57" for the 34
I run an ultegra triple gruppo

currently running 10 speed cassette

I don't know how they'll do under load with a trailer, but they're doing fine in the market otherwise. IRD makes good stuff. You can still use a 9-spd derailleur with them, but you might need to buy a new one to accomodate the larger cogs. Most road derailleurs max out at a 26t or 27t cog.

There are some disadvantages to 10-spd....their best use is for fast road riding. Why not stick with a 9-spd cassette that goes from 12-32 or thereabouts? You can get those from several mfrs. Unless you just want to drop a lot more cash, it seems simpler to do that and you'll still get the gearing you want. That extra 10th rear cog isn't a big deal really.

EDIT: A note in reply to SFR1224's answer below.....you don't need a new 10-spd derailleur or new chainrings to make this switch. In a news article last month, IRD was quoted as saying that 9-spd derailleurs work just fine with their 10-spd cassettes. People who have converted to 10-spd already know this.....the spacing for the cassette is the same, so as long as you have the chain and shifters, you're good to go. In this case, a new derailleur is necessary for the gear inches, but not because he may use 10 vs. 9 on the cassette. just an fyi. :o)

agreed, stick with the 9 sp. less hassle..

but they seem to work fine from what i've seen.

I am unclear on whether your touring bike currently has a 9 or 10 speed cassette?

If you are already running a 10 speed cassette, it should be pretty easy to go to the IRC cassette. You are almost certain to require a long cage derailleur to take up all the chain especially when using the granny gear.

If you are running a 9 speed cassette it is going to be costly and painful to go to a 10 speed cassette. You will need a new derailleur, a new chain, and new brake/shifters. There is a good chance you'll need new chainrings, as well. (Of course, it is always best to replace chainrings when putting on a new chain and cassette, so if you want to make the switch to 10 speeds, now is probably the time to do it.) Personally, I don't think going to 10 speeds will make enough difference to justify the expenditure.

Hope this helps.