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Is there a way to add a 16t to a 12-27???(6 posts)

Is there a way to add a 16t to a 12-27???Gall
Jul 7, 2003 6:48 AM
Hello again,

I have a 16t on my TT rig and I really like the way it feels. I have a 12-27 on my regular road bike. I need the because some of the climbs here in PA are in need of a 27 (well for me anyhow).

So I d like to keep the 27 but I d really like to add a 16. Any suggestions?

Thanks again!

how about this?DougSloan
Jul 7, 2003 9:26 AM
New: High & Wide $59.95 11 12 13 14 16 18 21 24 28
depends on the make and modeloff roadie
Jul 7, 2003 1:31 PM
You'll have to loosen the lockring and pull of the cassette, and see if thgere is some way to speperate the individual cogs. Often the lowest cogs are loose, and the higher ones are like rings mounted on a "spider" which holds maybe 4 cogs. If the smallest cog on the "spider" is bigger than 16, then your 16 can go below it, and you put all the rest on, minus the 12, or you drop the one that is just a bit smaller than 16, or whatever. It may end up looking funny- 13t on the outside puts a ramp on your outmust gear, and no ribs for the lockring- but it works just fine. Just make sure the smallest cog is actually engaging on the splines solidly. Some freehub splines don't extend all the way to the smallest cog; instead the small cog is usually a unit with its own spacer and the entire thickness of this cog / spacer combo is splined.

For more info on making your own clusters and which clusters have which cogs mounted on spiders vs loose, check

From the above link, I'm guessing you have either a dura ave or ultegra 6500. Bth have spiders that hold the 17 t and large cogs, and a 15t cog as the next smallest. So yes, very likely you CAN add a 16t cog, the only question is whether you will have to keep your 12.
Sure, what I did....Chen2
Jul 8, 2003 10:39 AM
Pull off the 12 and 13. Add a 16 and 13 with built-in spacer to work with the lock ring, parts from I've also used a 16 taken from an XTR mountain cassette. No problems at all. I ride a 13-25, 13-26, and a 13-27 9-speed Shimano, all have 16t cogs. Several of the Shimano road cassettes have 16t cogs but they are riveted to 17t cogs.
mines a bit more ghettooff roadie
Jul 9, 2003 8:45 AM
I use a 13-28 8 speed cassette made from an old LX 11-32 and a 12-23 sram grafted together. The 13 isn't the kind with a built in spacer and lockring nubs, I just have one of the old non-hyperglide freehubs. It shifts fine (very well, in fact). The lockring came loose after about 1k miles, but it didn't affect performance- I only noticed because it was noisy having all the cogs rattle around when I went over a bump! Now I pull my back wheel and inspect it every 500 miles or so, whether I got a flat or not.
Sure, what I did....ngl
Jul 10, 2003 9:55 AM
I think he still wants to keep the 12t and 27t.
Try 12 13 14 15 16 18 20 23 27.