What size bottom bracket do I need? Bottom brackets can be very tricky. Please read our blog post on Bottom Brackets, and if you still are not sure reach out to us for more help : ) Didn't find what you're looking for? Contact Us Related articles How do I choose the correct size dropper seatpost? Do you offer military disocunts? Do I have to pay sales tax? What countries do you ship to? What is your contact information?