crank arm length?

Today manufacturers of cranksets limit the cranklength sizes from 170-175mm.
The height of the rider will then largely dictate the length you need.
Smaller guys end up at 170mm while taller guys at around 175mm.

Got some data on crank length and BB-saddle height and their ratio of pro riders.

Boonen - 177.5mm - 80cm - 2.22 (177.5/80)
Gesink - 175mm - 83.5cm - 2.1
Sastre - 170mm - 72.5cm - 2.34
Cavendish - 170mm - 70cm - 2.43
Armstrong - 175mm - 75cm - 2.33

The idea is to maintain the ratio near these values maybe 2.2-2.3.
If anyone would notice, armstrong doesn't ride low much compared to others in the TT position.

Mine now is 170mm - 76cm - 2.23
2 years ago is 172.5 - 75cm - 2.3

There is no difference on the feel when pounding the pedals or I am just body-deaf.
The big noticeable difference is that I can take a much lower position on the bike.
A smaller cranklength will need to increase the height of the saddle
thus giving a wider hip angle on the top of the stroke
which I can use to crunch lower and go aero without losing power.



DISCLAIMER: this is not exact science just another level of analysis deeper when choosing the crankarm length.
The best fitter (no bike shop) with a adjustable bike may give you the optimal crank arm length according to the measurements of your leg, foot and pubic hair.

Then I will need to change my crank to 154mm....

Not a good idea...

Makoy wrote:Then I will need to change my crank to 154mm....

Not a good idea...

not a good idea kung nakabili kana ng crank
kaso it is a good idea to improve biomechanically on the bike.

"the bike should fit you and not you fit the bike"
stating in another way
"it is the bike that goes for a bikefitting to fit you and not you to be fitted into the bike"

155mm cranks can be customized only so use the 165mm.

theoretically pwede... patira mo kay sulaiman!

so how? ano sukat ko? anu po yung fit sa height ko na 5'10 (178 cm ata). suggestion po... thanks

when cycling I tend to shift around on the saddle which I think makes more impact than crank length.

If you are stuck with whatever crank length you have, work on your pedalling technique instead.

Si voeckler ata ito ah.

i'm using:

170mm road bike
175mm mtb; low cadence... like the extra leverage but hate the feeling of pedalling a big circle. i need suggestions on this.

skid wrote:i'm using:

170mm road bike
175mm mtb; low cadence... like the extra leverage but hate the feeling of pedalling a big circle. i need suggestions on this.

financial help?

skid wrote:i'm using:

170mm road bike
175mm mtb; low cadence... like the extra leverage but hate the feeling of pedalling a big circle. i need suggestions on this.

MORE TRAINING?

skid wrote:i'm using:

170mm road bike
175mm mtb; low cadence... like the extra leverage but hate the feeling of pedalling a big circle. i need suggestions on this.

more b2b sexcapades?

skid wrote:i'm using:

170mm road bike
175mm mtb; low cadence... like the extra leverage but hate the feeling of pedalling a big circle. i need suggestions on this.

Bili ka ng motor?

Proud2bpinoy wrote:

skid wrote:i'm using:

170mm road bike
175mm mtb; low cadence... like the extra leverage but hate the feeling of pedalling a big circle. i need suggestions on this.

Bili ka ng motor?

actually dumating na order ko, sabi nung gumawa ayus daw yung model ng napili ko kasi hindi gaanong maingay eh magaan pa (< 350 g) !
auto-on kapag < 40 cadence.

skid wrote:

Proud2bpinoy wrote:

skid wrote:i'm using:

170mm road bike
175mm mtb; low cadence... like the extra leverage but hate the feeling of pedalling a big circle. i need suggestions on this.

Bili ka ng motor?

actually dumating na order ko, sabi nung gumawa ayus daw yung model ng napili ko kasi hindi gaanong maingay eh magaan pa (< 350 g) !
auto-on kapag < 40 cadence.

new model dre?

what watawat did u buy ... parang gusto ko din yan... yan b din ung gamit ni Fabian?