Questions about cranks, which are the pieces of metal the pedals are attached to and then, in turn, rotate the bottom bracket and chainring.

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2
votes
1answer
272 views

What types of BB-axle to crankarms interfaces are there?

On the lowest end, we have the taper/square interface. I believe it is standard i.e. there are no variations in the sizes. image property of VP Components USA Then there is the octalink. Actually ...
19
votes
2answers
410 views

Selecting the right crank length

What is the best way to determine the correct crank length for my height and more specifically my leg length?
23
votes
13answers
63k views

Creaking from cranks/spindle. How to fix?

Recently the cranks on my bike started to creak. I checked with my usual "bike-bible" Park Tool. They recommended dis-assemble, lubricate, re-assemble. So I did that. Remove cranks. Remove spindle. ...
26
votes
12answers
25k views

Triple vs Double chainring?

I'm bike shopping for my first road bike, and I've asked for a lot of advice from my father who was a serious cyclist once upon a time. After showing him one prospective bike, he dismissed it with a ...
11
votes
4answers
5k views

Differences between Biopace and Rotor cranks

On mountain bikes of a certain age, "Biopace" chainrings are ubiquitous. These chainrings are (purposely) not circular. It seems that most people today agree that Biopace rings didn't live up to the ...
9
votes
2answers
222 views

Why such a tiny difference in crankarm length?

Why are there only 170 and 175mm lengths for the crank arms of MTBs? I would have guessed that touring bikes would benefit from far longer crank arms than those, suitable for mountain riding.
5
votes
2answers
297 views

What is the effect of changing length of crank arms?

There are some length options for the crank arms - like 170mm, 175mm. What is the difference for the rider? In which way does it effect the commute? Tried looking at Selecting the right crank ...
10
votes
7answers
15k views

How to remove a crank arm with stripped threads?

A friend called me up yesterday after a mis-adventure during his attempt at a bottom bracket overhaul. He stripped out the threads on the (left) crank arm while using a Park crank puller. In a pinch, ...
7
votes
4answers
5k views

What should a big guy look for when buying a road bike?

I'm 6ft 4" (1.8m) and 22st (139kg). I do a fair bit of cycling, mainly spinning and mountain biking. I would like to get into road riding so I'm looking to buy a road bike. I want to spend between ...
4
votes
4answers
745 views

Cruiser bottom bracket is clicking and grinding

My Trek Pure Deluxe 3-speed cruiser has been making a clicking noise when riding for some time. The problem is faint, and is more felt than heard. However, it's been getting worse; it now makes a ...