In this a compact crank ?

[Slowbee]

 

 

 

Is this a compact crank. The writing on the inside of the crank  is 175mm?

 

Slowbee2008-06-11 03:56:43

[Minion]

175mm is the crank length. Compact refers to the number of teeth on the chainrings.

The number of teeth should be stamped somewhere on the ring. Otherwise you could count the teeth manually. A normal crank will have 53, a compact 50.

 

[Chrispy]

Compact crank is when the chainrings are 50-36 not the crank length?

[Slowbee]

Edman, do 3 teeth make that much of a difference?

 

 

[Wonder Woman]

Slowbee, i think these two guys basically have given you what you need.

 

A normal crank would have 53 teeth ont he big chainring and 39 on the small one.

 

A compact crank is smaller in size and normally has 50 teeth on the big chainring and 34 on the smaller one....

 

so in reality you will need to spin faster at the same speed as someone with a normal crank but you also don't need as much strength for the hills.

 

The crank arm can still be 175mm or 172.5mm that depends on how tall you are!!

 

For instance mine is 170mm!!

 

Hope this helps!!

 

[Wonder Woman]

Edman' date=' do 3 teeth make that much of a difference?

[/quote']

 

You'll be surprised what a difference it makes!!!

 

 

[Slowbee]

 

thanks WW, it does!

 

Will be counting teeth tonight ...and not crows ...

 

[shaunh]

Edman' date=' do 3 teeth make that much of a difference?

[/quote']

 

You'll be surprised what a difference it makes!!!

 

 

 

Ya, asch A CAPIE, hes only gotsch 2 misshing and he speaksch like disch!!

[Slowbee]

bwaha ha !! Good one shaunh

 

 

[Ox_Wagon]

It is about the bolting diameter.  It allows you to run a smaller inner chain ring (34/36).  To confuse things, you do get 52 chain rings for compact cranks and if you really want throw a spanner in the work it is the same bolting diameter as the old ?non-compact? MTB cranks. I had one on my Mongoose. 

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[Slowbee]

Ox its freezing cold in paarl..... brain freeze and all, lets go slow! Going to have to google this confused mess to make sure.

 

The other alternative, is just not to care and get on my bike and just ride !

 

[Wonder Woman]

I like your idea of thinking Slowbee....just go for a ride and forget teeth!!!

[Ox_Wagon]

Have a look here.

http://www.sheldonbrown.com/gloss_bo-z.html#bcd

 

Injoy the ride.

 

 

 

[HomerSimpson]

For a simple comparison:  standard compact is 50/34.  If you run a 11-23 casette at the back your most difficult gear ratio will be 4.54 (50-11), while the easiest will be 1.47 (34-23).  With a standard 53/39, the ratios will be 4.81 (53-11) and 1.69 (39-23).  So you lose about 6% on the most difficult gear if you go to a compact, while the lightest gear is about 13% "easier" with the compact.

Conversely if you stay with 53/39 and use a 12-25 casette the compact option (with a 11-23) has a slightly higher ratio for the biggest gear (4.54 vs 4.41) while the lowest gear is still easier for the compact (1.47 vs 1.56)

Ok, this is getting confusing.  I'm going on lunch now.

[Gumpole]

Slowbee' date=' i think these two guys basically have given you what you need.

 

A normal crank would have 53 teeth ont he big chainring and 39 on the small one.

 

A compact crank is smaller in size and normally has 50 teeth on the big chainring and 34 on the smaller one....

 

so in reality you will need to spin faster at the same speed as someone with a normal crank but you also don't need as much strength for the hills.

 

The crank arm can still be 175mm or 172.5mm that depends on how tall you are!!

 

For instance mine is 170mm!!

 

Hope this helps!!

 

[/quote']

 

so in reality you will need to spin faster at the same speed as someone with a normal crank but you also don't need as much strength for the hills.

 

With my compact crank I didn't spin faster i just rode in different gears - so instead of being in a 39/19 up a hill I would be in 34/17 without much difference in cadence.
Also you will need the same strength up hills, just when hills get really steep (for your ability) it is nice to have some more gear options around!

 

[bontie]

I think the question was :"Is this a compact crank?" The answer : I doubt it, that looks like a standard 53/39 setup. Besides that is a Veloce crank of a year or 2 (or more) ago, did you get that in compact?