Bike Cranks

i really need a answer asap but what size of bmx bike cranks would you need for a 20″ inch frame?

It has nothing to do with the size of the frame, its the size of the bottom bracket that matters.

Installing a Bicycle Crank Arm

NEW Bike Bicycle Fixie Shun 48T Pink Crank Crankset $42.99

Vintage Nashbar Early 80s Mountain bike frame and fork with crank $49.00

SINGLE SPEED/FIXIE/TRACK BIKE CRANKSET CRANKS 165 BLACK $41.87

Bike 17.7cm Crank Length 32T Chainring Front Crankset $18.04

New Icetoolz Xpert crank arms removal tool Bike 04A4 $17.95

Campagnolo Centaur 10 speed Road Bike Crank – New 170mm $30.00

NEW Lot 8 Crank Brothers Pedal Spindles // Mountain Bike Clipless rebuild $0.99

2008 Colnago CLX Full Carbon Road Bike 54cm Compact Crank Full Campy 20 spd $1,999.00

20 mil multipatch kit FRAME & CRANK bike protection by CRANKSKINS $14.99

Crank Brothers Cobalt Locking Mtn Bike Grips Blue NIB! $19.95

Crank Brothers Cobalt Locking Mtn Bike Grips Silver NIB $19.95

EASTERN BIKES MID 19MM CRANK BEARING KIT $25.00

NEW 2012 Crank Brothers Cobalt 11 29″ Carbon Mountain Bike Wheelset $1,899.00

NEW 2012 Crank Brothers Cobalt 3 29″ Aluminum Mountain Bike Wheelset $850.00

Eastern Bike Electron BMX Cranks 175mm Black $69.93

SINGLE SPEED/FIXIE/FIXED GEAR/TRACK BIKE BICYCLE CRANKSET CRANKS 175 WHITE 175mm $27.87

RaceFace cross-country XC left-hand 175mm Bike Crank, powder coated, royal blue $1.56

SINGLE SPEED/FIXIE/TRACK BIKE CRANKSET CRANKS 165 BLACK $41.87

MTB Bike Bicycle Mountain Crank Puller Removal Remove Tool + Wrench Handle $0.99

Schwinn Dated Crank 26″ Bike 1961 $4.95

2010 SHIMANO 550 FC-R550 172.5mm 39/53t Road Bike Crankset W/BB Alloy Crank NEW $59.97

2010 SHIMANO 550 FC-R550 175mm 39/53t Road Bike Crankset W/BB Alloy Crank NEW $59.97

PIT BIKE PITBIKE GASKETS GASKET SET HEAD GASKET CRANK BASE EXHAUST GASKET 110cc $15.78

PIT BIKE PITBIKE GASKETS GASKET SET HEAD GASKET CLUTCH CRANK STATOR GASKET 125cc $15.78

Cook Bros. Racing Mountain Bike Crank Arms Crankarms Square Taper 172.5 110 5 $99.99

PIT BIKE PITBIKE HEAD GASKETS FULL GASKET SET CRANK STATOR CLUTCH GASKET 125CC $15.78

SINGLE SPEED/FIXIE/TRACK BIKE CRANKSET CRANKS 165 BLUE $31.87

Crank Brothers Premium Mountain Bike Race Cleats 117389 $22.00

MINI MOTO MINIMOTO DIRT BIKE RACE BIKE ENGINE GASKET SET HEAD EXHAUST CRANK CARB $6.16

PARK BIKE BICYCLE CCP-22 CRANK PULLER WRENCH TOOL NEW $14.87

Crank Brothers 2012 Cobalt 2 MTB Bike Stem Black/Silver 6 degree – 110mm $64.95

Crank Brothers 2012 Cobalt 2 MTB Bike Stem Black/Silver 6 degree – 100mm $64.95

Crank Brothers 2012 Cobalt 2 MTB Bike Stem Black/Silver 6 degree – 120mm $64.95

2007 SUZUKI GSXR600 CRANKSHAFT CRANK $149.95

sugino 75 fixed gear track bike crank set $74.00

NEW CRANK BROTHERS COBALT 11 CARBON SEATPOST 30.9MMx400MM BIKE BICYCLE $167.67

SINGLE SPEED/FIXIE/TRACK BIKE CRANKSET CRANKS 165 BLACK $34.87

SHIMANO 550 FC-R550 170mm 39/53t Road Bike Crankset Crank Alloy Silver w/BB NEW $88.97