Questions on Terminology, and general knowledge

[unibikeling]

Hey, ive been hearing a lot of words/terms being used, and have no clue what they mean. It'd be cool if you could answer the questions.

What is "bb"?

What is the difference between High and Low "bb"?

Whats a good general "bb" for a bike?

What does geometry mean for bike trials?

I also see different frame designs. Some of the top bars are just flat, and run straight form the stem to the rear tire. Others are doubled up tubing, and run from the stem, then bend, go straight, and then go to the rear tire. What is the difference in those? What does it matter in each?

kay thanks.

[alexzero13]

Hey, ive been hearing a lot of words/terms being used, and have no clue what they mean. It'd be cool if you could answer the questions.

What is "bb"?

What is the difference between High and Low "bb"?

Whats a good general "bb" for a bike?

What does geometry mean for bike trials?

I also see different frame designs. Some of the top bars are just flat, and run straight form the stem to the rear tire. Others are doubled up tubing, and run from the stem, then bend, go straight, and then go to the rear tire. What is the difference in those? What does it matter in each?

kay thanks.
BB stands for Bottom Bracket
Being a beginner myself, thats all that I can help you with :(

[stpatr3k]

Geometry means everything relating to getting good fast in biketrials, although you can ride biketrials with a crappy Geo but you will get good with a perfect geo instantly in some cases.

BB (Bottom Bracket) height affects your position on a bike. High BB are beneficial in some aspect compared to a low BB bike but is also better in some aspect. BB height is the how high your BB relative to the line between your front hub and rear hub

I have a coust v1 - ish Geo, 0 BB and ride it streets. Anything starting on a 0 BB will be good in biketrials compared to a negative BB. Higher BB will make you better on the rear tire. Ask someone else on Upping because I haven't gone further than gap on a high BB bike.

Low BB's are around 0-30mm (am I correct?) and high BB are more than that.

[Blitzmo]

I also see different frame designs. Some of the top bars are just flat, and run straight form the stem to the rear tire. Others are doubled up tubing, and run from the stem, then bend, go straight, and then go to the rear tire. What is the difference in those? What does it matter in each?


Just like you said, those are just different frame designs. Those which "bend" will probably give more clearance but that will matter if you tuck a lot. The top tube doesn't really matter that much, just take a look at the old school frames.