None that I know of, other than grinding or filing the fittings larger dia. to fit the 31.8mm. I've done that for some things (eg stems :) and it works - esp for those clamps there is usually lots of material.

Also for the stem my LBS fitted a pleated shim to upsize a 26mm bar to fit 31.8mm. It's been rock solid. The base bar is just an old school tube bull horn, aero bars clamped on. The setup is my favorite over anything else I have.

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Buy a used pair of 26.0mm bars. You can get a nice vision one for $50 on ebay. Profile design is less. Don't mess with trying to grind or whatever the stem or aerobars to fit.

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Brandon Marsh - Website | @BrandonMarshTX | RokaSports | 1stEndurance | ATC Bikeshop |

Yes I was thinking I would have to either get a new handlebar or just different aero bars(not my first choice).

Another question though:

Since my stem is aluminum, and the fittings on the aero bars are also aluminum (i think), is there a problem with getting a carbon handlebar or is it better to just stick with aluminum so that it's all metal-to-metal?

It doesn't matter. Just get the correct sized bar/stem, and if there's a torque spec tighten to the torque spec.

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Brandon Marsh - Website | @BrandonMarshTX | RokaSports | 1stEndurance | ATC Bikeshop |

Just get new aero bars that fit 31.8. Getting new drop handlebars, tape and a new stem is going to be significantly more expensive than just getting new bars that fit your bike.

He already has a 26 stem and clip ons.

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Brandon Marsh - Website | @BrandonMarshTX | RokaSports | 1stEndurance | ATC Bikeshop |