Randybb

I'm going to build a new wheel set for a single speed bike project, and I'm seeing hubs that have freewheel threading on both sides. What's the purpose of this? I understand fixed/free, but free/free? You wouldn't be able to put two different sized freewheels on each side, since the chain could only be the correct length for one of them. Anyone know of a use for this?

Scrodzilla

Not true at all. You can use two different sized cogs on a hub and keep the same chain, so why would that be different when using two freewheels?

Post a link. I want to see this free/free hub.

Randybb

I suppose you're right, if you had track dropouts. My project is for a MTB frame with vertical dropouts though. How big a difference in teeth could I theoretically get away with?

Here you go -- this is the type of hub I'm considering atm (it's the MTB hub)

seau grateau

As many teeth as you want if you use a tensioner.

Scrodzilla

Yeehaw!

Randybb

If you're gonna use a tensioner, why not just get a derailleur and cassette?

Randybb

Also I'm picturing someone jumping off their bike at the bottom of a hill to flip their rear wheel.

seau grateau

If you're gonna ride single-speed, why not just get a frame with horizontal dropouts?

Scrodzilla

If you already know all the answers, why are you asking questions?

Randybb

Do you know of any MTB frames with horizontal dropouts? Bonus points if you know of any that I already own.

Randybb

I don't know the answer -- I didn't think about horizontal track dropouts when I first posted, because I'm looking at MTB hubs with an MTB frame.

I was genuinely curious if there was a use for a free/free mtb hub that I couldn't think of. I still am.

Regulatori

You talking about track style horizontal ends? I used to own one....old Kleins.

Randybb

Neat, I've never seen that before. If it was really critical for me to have two different sized gears on my bike, I think I'd consider finding one of those frames -- but since I already have a nice frame, it's probably not worth the cost.