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How to measure bicycle q-factor

The app that made my day is app of the day. There'
You can enjoy Ambalco cycling game right there on
We are totally different. Zwift is your coach, GET
Extreme weather in the whole world right now
We’ve got all the tips you need to have the trip o
When the sport event slot is booked, no more meani
Wherever you travel, your bike is your friend.
The truth is, your enemy is inside.
The most beautiful roads are here. Charming Island
Biking is 0% emissions, 100% emotion. And it's ano
Sharp turns, narrow road, crazy speed and tough co
For BMX riders, #bmxordie is all about living for
Indoor cycling game workouts can be exported to St
The fastest indoor cycling game setup in the whole
For Valentine's day, he gave me Chocolate Powerbar
It doesn't matter how many people are watching whe
Spotted @sarkanice
Just like it supposed to be: free unlimited entert
At least half of the day you work for the dead peo
Tons of videos gamified by our users
Minimal weignt? No! Clipless pedals? No! The secre
Indoor cycling made cool. Again.
Too much rain and hail even for tough guys - first
Some of the tires I’ve tried, got warn out and pro
Try this at home!
Some things are build to last. If not - rebuild!
It's not in China, and it's not Tour de France.
The robo-bike is here.
measuring bicycle q-factor

You can measure Q-factor without removing the cranks and bottom bracket. First, use some ruler or slide calipers as shown on the picture to get the distance between outer edge of the valve and outer edge of the left crank.

measuring bicycle q-factor step 2

Then make the same measurement on the right side, and make the calculation: left distance + right distance - valve diameter. I have an auto valve (shraeder) 7mm diameter. So my calculation is 83 + 83 - 7 = 159mm. Not bad for the MTB crankset.

FSA small q-factor road bike crankset

Narrow crank arms ( smaller Q-factor ) provide 5% more power and save your knees in the long run. The opposite - wide Q-factor (more than 190mm) just feels uncomfortable, especially if you're narrow-assed.

Smaller q-factor crankset

If your bike is MTB, hybrid or touring - the fast and easy way is to change the crankset to some road double or triple. Got road bike? Need to change the bottom-bracket to some shorter-spindle model.

force crank arm removal

My story is way more complex. I just wanted another chainring sizes, and bought the common MTB crankset at the local bike shop. It took me hours to remove the old cranks, it was a man-vs-metal fight. When the official crank-removal tool was broken, I just used the saw to get rid of the old crank arm.

bottom bracket replaced

It turned out with the new crankset the Q-factor increased from ~186mm to more than 190. For the ultra-narrow ass guy that I am it feels like riding the elephant. One more exhausting man-vs-metal round, and the old stained bottom-bracket was changed to brand new shiny FSA aluminum alloy gear. 126mm to 103mm - 23mm difference. Oh yeah ).

left crank machined

167mm q-factor I’ve got after the bottom bracket change is pretty normal for the hybrid bike, but I wasn't going to settle. I machined the crankset to rip off 4mm from each crank arm.

changing q-factor

Then I’ve machined the edge of the bottom bracket - just 1mm. Almost there, just need to cease this gap. Keeping the chain line is not a problem cause I got rid of the 22-tooth first chainring and 32-tooth chainring is now the first.

Smaller q-factor diy

Some polishing to make the crank arm fit the bottom bracket spindel much closer to the bottom bracket edge. 5mm gap still left for the press-fitting of the crank arm. It’s important not to polish too much - or it will be too loose to press-fit.

small q-factor crankset

Hooray! The crank arms are fitted to the bottom bracket edges, there’s no gap at all. And the new 159mm Q-factor is so comfortable! When it comes to the bike ergonomic half inch difference is an abyss between pain and absolute comfort. Keep trying different components, the result worth the efforts.

Alex Belinski
Alex Belinski
I'm Alex, that crazy guy behind GETHIGH cycling game.
And I'm nothing without the team
The app that made my day is app of the day. There'
You can enjoy Ambalco cycling game right there on
We are totally different. Zwift is your coach, GET
Extreme weather in the whole world right now
We’ve got all the tips you need to have the trip o
When the sport event slot is booked, no more meani
Wherever you travel, your bike is your friend.
The truth is, your enemy is inside.
The most beautiful roads are here. Charming Island
Biking is 0% emissions, 100% emotion. And it's ano
Sharp turns, narrow road, crazy speed and tough co
For BMX riders, #bmxordie is all about living for
Indoor cycling game workouts can be exported to St
The fastest indoor cycling game setup in the whole
For Valentine's day, he gave me Chocolate Powerbar
It doesn't matter how many people are watching whe
Spotted @sarkanice
Just like it supposed to be: free unlimited entert
At least half of the day you work for the dead peo
Tons of videos gamified by our users
Minimal weignt? No! Clipless pedals? No! The secre
Indoor cycling made cool. Again.
Too much rain and hail even for tough guys - first
Some of the tires I’ve tried, got warn out and pro
Try this at home!
Some things are build to last. If not - rebuild!
It's not in China, and it's not Tour de France.
The robo-bike is here.

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