Question about Cyclone Gt Fsa Cpi 3 Piece Bmx Crank Arms 175mm

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Re: Cyclone Gt Fsa Cpi 3 Piece Bmx Crank Arms 180mm: Need to know the weight, thanks.

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What is the crank bearing size??


Almost all Mongoose models use the standard BSA 68.
I would write a question to them at:
http://mongoosebikes.net/mongoose-bmx-bike/20-mongoose-mode-270-v2-freestyle-bmx-bike/
This bearing should not fail during the normal life of the bicycle, unless the rider weight is over 80 Kg.

Jun 10, 2014 | Mongoose 20" Mode 270 Boys Freestyle Bike

1 Answer

Crank has become loose


John,
If this is a one-piece crank (both crank arms and the axle are all one piece) then you would need to tighten the bearing. This has an adjusting nut and a large locknut. There are special tools for this, but you can get by with a pipe wrench for the lock nut.
However, if this is a three-piece crank, then you probably have a loose crank arm (or two). The axle (which you cannot see) has square ends (about 1/2 inch) that are tapered toward the end (just a little smaller). The cranks have correspondingly tapered square holes. You simply have to tighten the nut or bold on the end of the axle to draw the tapered parts together tightly. There is probably a little cap covering the nut or bolt. The cap usually unscrews with a straight screwdriver. Common size for the nut or bolt is 14 mm. You will need a thin-wall socket for this, or a special crank-arm wrench. Park Tools is a great source for the special tool and lots of how-to info and videos. Good luck.

Feb 12, 2013 | Diamondback Joker 20 Boys' Freestyle BMX...

1 Answer

So my Dynacraft Next turbo bicycle crank arms and pedals were wobbling and found out the issue was a bent bearing.So instead of taking it apart,we decided to hammer the bent bearing back into the crank...


the little balls are the bearings, ie: ball bearings, so they are the size, take them to a bike shop and get a replacement kit.
Your crank is probably not bent , it takes a big crash or something to bend one. there is an adusjment nut and lock nut to set them back up. could be LH thread on the left hand side

Feb 12, 2011 | Dynacraft Next Turbo Children BMX Bike

1 Answer

Where does it go


It goes inside the headset or head-tube, either on top or the bottom of the headset. The headset is the part of the frame where the handlebar neck fits into.

Jan 12, 2011 | Impact Fsa Integrated Headset Sealed...

1 Answer

Can i convert my old one piece crank to a three piece crank using eastern nomad cranks


Yes, but you will need a new bottom bracket (BB). You will need to buy a sealed American type BB.

Dec 26, 2010 | Eastern Nomad BMX Bike Crank 175mm Red

1 Answer

Hello, I have a very old schwinn bike and I need to replace the pedal arms. How do I get them off?


To remove 3 piece crank arms you will need a special tool called (fittingly) a crank puller. It threads into the arm and a center "bolt" torques into the spindle and pulls the arm off.

Sep 09, 2010 | Schwinn Cycling

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The crank on my bike is bent so im trying to get the pedals off of my schwinn z force bmx bike but i dont know how. was wondering if you could help?


Hi, As your BMX has 3 piece cranks. Here is how to go about it:

1. Unscrew the plastic cap on the side of the crank - driveside.

2. Take your 14 mm socket and ratchet, unscrew the bolt that holds the crank to the axle. Remove the bolt of both cranks(Left and Right). You can squeeze the handle of the ratchet and the crank together like pliers to give you more leverage.

3. Take the puller and screw it's socket inside the threaded hole of the crank. Hold the crank and turn the puller handle clockwise until the crank arm falls off from the axle by itself. Remove both crank arms.

4. Go to the left side and with the pliers firmly held with both of your hands(This is where the pictures differ, I'm taking a picture at the same time.), unscrew the lockring from the bearing cup.

5. Now again firmly with both hands, grab the bearing cup with the pliers and slowly test the resistance. You do not want to slip here since this will definitely strip the thread on that cup. Hold those pliers hard and go slowly, it should get it going within a quarter turn and then you should be able to unscrew it with your fingers. If not, keep on going and be careful. Remove the cup.

6. Remove the axle and bearing crowns from both sides.

7. Remove the right side bearing cup by unscrewing it in a clockwise fashion. The notch are not very wide, so might have to hold the pliers on the cup with one hand and the handles with the other. Be aware that this cup is often very hard to remove. Again, you can always purchase a specialised wrench just for that purpose.

8. Clean and inspect everything. What you are looking for is a clean and even line on the axle and inside the bearing cups. Any pits in that line will damage the bearings and they will eventually self destruct. Replace any parts that need replacing.

9. Regrease everything, the axle, the cups and the bearings. I use regular green axle grease with a touch of white teflon grease. Make sure that everything you've pulled out of that frame is extra clean, including the hole in the frame where it came from. The most minute piece of dirt can ruin your repack job.

10. Start by installing the right side bearing cup. Screw it in counterclockwise real tight. Insert the bearings and the axle. Insert the bearings in the left bearing cup and screw on the frame. Screw it until you feel resistance. Test to see if the axle turns freely and tug it up and down to see if there is any play. No play? Turns freely? If the answer is yes to both questions, install the lockring on the left bearing cup.

11. Reinstall the crank arms tightly. I would check them again in a few weeks to be sure. When you think it's tight enough, tighten some more. That's it, you're done.

Hope this helps and please vote if so :)



Aug 05, 2010 | Schwinn S2010WMB Z Force 20" Boy's BMX...

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