I want to swap out my deep drop Nitto 123s for a pair of bullhorns. With my current bars, I am using a 58 deg, 80mm Nitto JP stem. To switch to bullhorns, do I also need to change my stem to something with a larger angle? What is an appropriate stem angle to use with bullhorns? I do like the position of my bars now, but would like something with more flexibility with regard to hand position, as well as something that's more suited for climbing out of the saddle.

Helpful advice/instruction is most appreciated.

Good luck on that

Seriously though, I would try using the stem you have now and see how it feels before buying a new one. You will probably find it feels ok.

No need to get a new stem unless the clamp is the wrong diameter. You might want to pull the stem out of the fork a little bit to get the bars higher.

the answer is : 73 deg.

I always thought it was 42.

yea test it out first and let your body tell you what you need

if you're used to riding in the drops of drop bars you probably want an even deeper drop stem for bullhorns. If you're used to riding on the tops of your drop bars, you might want to stick with your current stem or get one with more rise. Theres tons of different bullhorns with drop and no drop so the stem you use will depend on your bar choice. I prefer a stem with a bit of rise, combined with bullhorns that drop, which means that I have a nice high hand position up near the stem, and a lower position when I'm holding onto the horns (kind of like drop bars in a way but backwards).

Your main problem will be that nitto stems and bars are 25.4mm and almost all bullhorns out there will be either 26.0 or 31.8.

There really is no answer as this is a fit issue and everyone is shaped differently.

You could just chop and flop your b123s. That would be cheap.

73 deg.

2nded