1. ## your maximum speed

When you run on a flat tarmac how much is your maximum speed that you can get on your best cadence? And how much is your gear ratio?

I got 33.1 km/h with 38/14 gear ratio and CST Copperhead tires.

How much is yours?

2. Just got clocked by radar at 16 mph with 33/18 @ about 120 rpm on a 29" with panaracer rampage with 20 psi.

3. I'm more concerned with how fast I can bomb when the terrain points down. Around here in Indiana, best I've gotten is 28. Not a lot of long downhill sadly.

4. Flatland pavement, 33 x 17 stock Karate Monkey 29er with Exiwolfs, 18mph before spinning out. But I am pedaling like a crazy woman to keep the drive engaged. Comfortable flatland speed is about 15mph. I am a runner, so my legs are too strong for my stock gearing. I need to change the rear to a 19.

5. Originally Posted by Nakedbabytoes
..I need to change the rear to a 19.
why you decide to change the rear with the bigger one? isn't it become much lighter for your legs?

6. I can touch 28mph at a stupid-high cadence, and I can cruise at 19 for a long time at a maintainable high cadence.

34x19@29"

7. Originally Posted by cassava
why you decide to change the rear with the bigger one? isn't it become much lighter for your legs?
Yup, I need a challenge Nah, I just mis wrote, that's all. Smaller rear or bigger crank ring is what I meant.

8. Sheldon Brown's Gear Calculator has a great feature for this question. Sheldon Brown's Bicycle Gear Calculator

You can select your gear combinations and then under Gear Units, select MPH @ a specific cadence. For example:

Gear chart using MPH @ 120 RPM

For 29 inch (nominal) tire with 175 mm cranks

32 x 18 @ 120 RPM = 18.4 MPH

Pretty cool!

9. I don't ride flat tarmac enough to ever gear for it. My gearing is for going up and down. I commonly reach 30-35mi/hr without even pedaling. And, i'm a slow poke.

10. Originally Posted by jetboy23
I don't ride flat tarmac enough to ever gear for it. My gearing is for going up and down. I commonly reach 30-35mi/hr without even pedaling. And, i'm a slow poke.
Man, must be nice to have hills that let you get those kinds of speed going down. Though, I'm sure you pay for em on the climb! Gotta pay to play, right?

11. I can touch 21 km/h without high cadence, my bike is a 29er, with 32x20 and I am very happy

12. I got around 35-40kph on flat with 32x18 on 26. Tire CST cheyene 2.40 yes I am a hamster LOL.

My normal speed is 28-33kph-ish, yes I like it spinning cadence like hamster.

13. I just got clocked at 14 mph. 32/20, igniters. Riding to work, no super crazy cadence.

14. Flats are for resting in between climbs

15. low to mid 20s (22-23 mph) with 29" Rocket Ron @ 24psi and 175mm cranks turning 32X18 spinning like a mad man...

16. ## your maximum speed

Much faster than I can hike mostly.

17. Just did an experiment on my commuter 700c SS with 44x16 gearing: 120 RPM gives me 43 km/h . Normal cruise speed on flats is a weak 80 RPM for 28 km/h, have to work it up to 90ish RPM.

It is a cheap \$250 bike so I bought two. The other one is 39x16, it gives me higher average speed on my 20 mile commute according to GPS, I guess I climb faster with the easier gearing.

Need to harden the *** up!

18. My top speed pedaling is actually on a slight climb. On my 29'er geared 32/18 I can hit 30 kmh (18.5 mph) when going up a very easy climb. When I try to do the same om flat ground the bike kinda runs away from me and I end up bouncing all over the place when doing those kinds of cadences - adding a tiny bit of resistance by going up a very easy climb keeps everything nicely in check and allows me to pedal faster.

Still, going down hill I can go a lot faster but that's without pedaling..

19. Never tried on my SS (don't have a tacho on it) but on my road bike I once hit 180 rpm on 42/21.

If I manage to do 160 rpm on my Ogre at 36/19 that would make 42 km/h or 26 mph.

Hmmmm...maybe I should try this out.

20. ## your maximum speed

Since I live in the Bay Area, my maximum speed is 14.99 mph.

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