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What's the smallest inner double chain ring made?(9 posts)

What's the smallest inner double chain ring made?jose_Tex_mex
Aug 28, 2002 12:39 PM
Right now I have the standard 39 but was wondering what the smallest they make is. Why? Just wondering, as I will be going to the EU next year to check out some of those mtn's we always see on the tour. From what I hear, I don't think I will be too happy with a 39 going up Ventoux.
Yes, I could do a triple. However, if I could get a few less teeth, even 2 or 3 all should be well.
depends on the bolt circle diameterlonefrontranger
Aug 28, 2002 1:21 PM
Shimano = 130mm BCD. I believe this translates to a 38 minimum.

If you run a 110 crank (common 'cross dual ring spec), then you can go as low as 34, if memory serves. I'm sure TJeanloz will chime in with specs.

You would be better off if you're using Shimano stuff to run a 27 or 29 tooth rear cog.
What's your bolt circle diameter (shimano or campy)? nmgreg n
Aug 28, 2002 1:31 PM
Shimano Ultegra Hollowtech- 170mm nmjose_Tex_mex
Aug 28, 2002 3:16 PM
Shimano Ultegra Hollowtech- 170mm nmseyboro
Aug 28, 2002 6:06 PM
A REAL 38 ring will fit and is the smallest I am aware of. Us lowlanders throw a 32 or 34 on the rear for good measure when we go to the hills of eastern NC. With that setup (and an XT rear derailleur) you can limb up a tree.
hills of eastern NC?? (nm)KenS
Aug 29, 2002 12:52 PM
I don't think I will be too happy with a 39 going up Ventoux.Cat 4 boy
Aug 29, 2002 1:41 AM
Glad to hear of your trip to Europe, the country around the Ventoux is gorgeous, I was there 3 weeks ago, just after the tour.
If you're going up, make sure you're feeling TUFF! I'd do Alpe D'Huez twice rather than the Ventoux again. I used 39x25 & was down to 6.5mph thro the forest after St Esteve.
If you are race fit, then 25, 26 will do, other wise use a 29, or get the triple. It's not clever to be over geared on that mountain.
And please pay your respect's to Tom Simpson on the way down.
re: What's the smallest inner double chain ring made?pmf1
Aug 29, 2002 4:59 AM
Siguno makes a 38 that works fine on a Shimano double (hey, every little bit helps). Excel sells them. Its cheap (less than $20). I used that and a 12-27 on Ride the Rockies and was fine.
re: What's the smallest inner double chain ring made?MrCelloBoy
Aug 29, 2002 12:51 PM
38 I believe.
Rode the Terrible Two this past june w/38-28 low gear.
Finished, but was very tired.

Walked about 1.5 miles total on the steepest parts of the 16,000' gain course.