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Discussion Starter · #1 ·
Quick question, on a 13-25 shimano 105 9 speed cassette, is the 16 tooth cog loose or is it part of the retained group?

Why? I am switching my triple to a compact and after messing around with the gearing charts I found that running a 13-27 is the perfect option. I plan on mixing a 12-27 ultegra cassette with a 13-25 105 to get 13,14,15,16,17,19,21,24,27. I get the 13 with the lockring and the 16 from the 105 and loose the 12,13 from the Ultegra.

Any reason this won't work?

I have searched and can't find a solid answer, I know the brain trust at RBR will have the answer.

Thanks - Dave
 

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no loose 16

DriftlessDB said:
Quick question, on a 13-25 shimano 105 9 speed cassette, is the 16 tooth cog loose or is it part of the retained group?

Why? I am switching my triple to a compact and after messing around with the gearing charts I found that running a 13-27 is the perfect option. I plan on mixing a 12-27 ultegra cassette with a 13-25 105 to get 13,14,15,16,17,19,21,24,27. I get the 13 with the lockring and the 16 from the 105 and loose the 12,13 from the Ultegra.

Any reason this won't work?

I have searched and can't find a solid answer, I know the brain trust at RBR will have the answer.

Thanks - Dave
Sorry, ultegra, 105 and tiagra all have the 16 tooth as part of a combination.

TT
 

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Discussion Starter · #4 ·
Well I spent some quality work time with my good friend google and found an exploded diagram of the cassette on shimmy's website. It would appear from their pdf that the 16-25 are captured.:mad: I am going to get one and try to take it apart anyway.

As far as being undergeared, I spent quite a bit of time breaking it down, looking at what gears I use, how I ride, the terrain I ride and the group I ride with and I think the 13-27 with a 50-34 will be great. If it's not I can always go back to the 12.

Dave
 

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Good idea, most of my cassettes begin with a 13. I've bought individual 16's from Sheldon Brown. I've also used the individual 16 out of a 12-34 XTR cassette. As for the 13-25 9-speed Ultegra, the 16 is pinned together with the 17. It looks to me as if it wouldn't be too hard to separate them. Both have the inside splines that fit the hub shell so they can be used as individuals if you can get them apart.

Al
 

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Should work. I believe that the 105 cassette has individual cogs riveted together. You could use the "bottom" half of an Ultegra 12-27, with the "top" half of a 105 cassette.
To save money, you could buy a 13-25 HG-50 cassette from the Tiagra group. If you can get by without the 13, Nashbar has a 14-25 HG-50 9 speed cassette for $20.
A 14-27 would make interesting gearing.
 

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Larry Lackapants
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Some lage cogs are held together by screws

I've recently bought a tiagra 12-23 with 23-21-19-17-16 being riveted together. I took a small file and filed down the rivet heads at the 23 cog side. it took me about 30 minutes for all three rivets. The catch was to remove the 23 cog applying some force at it's base, and then completely cut off the rivet heads. then the rivets just came out.

I have had an older 9 speed 105 12-25 cassette and the last 5 cogs were held together by allen screws. If it is your case too, the smallest allen wrench in your set will match those screws. The screw head is at the smallest cog of the 5, and the holes of the largest cog are threaded

Either way, just don't buy a cassette where the 16 is part of a spider (if there is such a thing).

Good luck,
br
 

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NeoRetroGrouch
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breadrunner said:
Flat or downhill, your buddies with standard cranks will leave you unless you spin like a top. I'm going the other direction, switching my 12 for an 11.
I'm impressed. A 53/12 at 110 rpm is 38 mph and you're getting dropped on the flats. You and your buddies are fast. - TF
 

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Don't you know that an 11 will make you go faster ? .....If I had a 10, I could go 45 mph on the flats.......................(on the moon)
 
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