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Got a diamond back mountain bike frame both crank arms are of wen got it but cant get center bit out

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You need a bigger hammer or the right tool.

http://www.parktool.com/blog/repair-help/categories/crank-service

Posted on May 22, 2011

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Posted on Jan 02, 2017

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2 Answers

Need to take off sprocketAnd cran kf from frame


This repair requires special tools, take your bike to the local bike shop for assistance

Oct 19, 2014 | Cycling

Tip

Identifying Your Reebok / Robix Studio Cycle


  • 9600
    Black matte finish on 1-piece welded frame. Black crank arms (generally) and dual brake pads.
  • 9800
    Black matte finish on 1-piece welded frame. Black crank arms (generally) and single brake pad.
  • 9900
    Glossy finishes w/angled back legs (stabilizer). Bolt-together frame (assembly required). Rectangle shaped stabilizers.
  • 2000B
    Glossy finish w/angled back legs (stabilizer). Bolt-together frame (assembly required). Oval shaped stabilizers and single brake pad. Silver crank arms and belt driven.
  • 2000C
    Glossy finish w/angled back legs (stabilizer). Bolt-together frame (assembly required). Oval shaped stabilizers and single brake pad. Black crank arms and chain driven.
  • 3000B Robix
    Black glossy finish w/angled back legs (stabilizer). Bolt-together frame (assembly required). Oval shaped stabilizers and frame down tube. Belt driven with single brake pad.

http://www.sportsmith.net/Categories.aspx?did=CEF96124-843A-4128-9B53-8E10980C9920

on Mar 11, 2015 | Exercise & Fitness

1 Answer

How do i remove the crank on a green machine. I have removed the outer cover and the inner bolt.


you need a crank puller...it screws into the outer cover( called a dust cap) threads, and then you tighten the bolt in the center and it pushes the crank arm off ( available at any bike shop)

Aug 11, 2013 | Shimano XTR Hollowtech II Mountain Bike...

1 Answer

How bike size is measured?


So what does "different frame size" actually mean? And what does that frame size number, 13" or 25" or whatever, mean? It's fairly simple.

The frame size number comes from the length of the seat tube. The seat tube is that nearly vertical tube of the three big tubes that make up the "main triangle" of the bike frame. The seat tube has the bike's saddle attached at the top, and has the pedals and crank arms attached at the bottom. A short seat tube will make the pedals closer to the saddle; a long seat tube will make the pedals further away. The frame size number is the length from the center of the crank arm spindle (the axle that holds the two crank arms together) up to the top of the seat tube (where the saddle and seatpost are attached). On some bikes this is measured in inches, on others in centimeters.

But that's not the only dimension that changes for different frame sizes. As bicycle frames get taller, they also get longer. That means the distance from the saddle to the handlebars gets longer. This makes sense, since tall people don't just have longer legs than short people. They usually also have longer arms, a longer torso, and so on. So the bike frame also needs to get longer in every direction for a taller rider, not just longer from pedal to saddle. The top tube gets longer, which pushes the handlebars further away from the saddle. The head tube (the frame part that the fork attaches to) gets taller, so the handlebars will be higher up. All of these dimensions and more are fine tuned in every frame size, so the right size frame for a person's height fits well everywhere, not just in the saddle.

Dec 21, 2010 | Cycling

2 Answers

The left arm of the cranck don't come out,so i can't take the cranckset off the bottom bracket.Every bolt it's already untight. Thanks!! Stefano


There are 3 bolts to remove: 1 the main large cap in the center of the arm, and 2 bolts holding the arms in place. Remove all three completely. If the arm still will not come off easily, then take a large screwdriver and work in between the bearings and the crank arm and gently pry off.

The trick is too only move a little then go to another section and move another small amount. until the crank arm wants to loosen. The most likely culprit is a small black piece of plastic that is holding up the works.

Nov 23, 2010 | Shimano XTR Hollowtech II Mountain Bike...

1 Answer

I am trying to find out what size the Mongoose sx43 is. It is from 2000 and is bright yellow.


It could be one of several sizes. To determine the size you can measure the bike from the center of the bottom bracket (where the cranks install into the frame) up the seat tube to the top of the frame. This will give you the size of your bicycle.

Nov 10, 2010 | Mongoose Exile 26 Men's Full-Suspension...

1 Answer

Cant get the pins out of the crank brackets on the bottom of the crank. got the bolts out but there are pins on each side of the bolts. most engines have two more bolts on the outside edge but this one...


The bottom bracket is the dohickey that connects your two crank-arms together, and secures them within the bottom of the bike frame. The bottom bracket has threads around the outside that secure it into the hole in the frame. Inside, bearings surround a rotating spindle -- this lets the pedals turn free from the frame. Each side of the spindle has a mechanism to connect your crank. This may be square tapered bolts, a toothed ring (splined bottom bracket), or even a threaded bolt. The bottom bracket type must match the crank type (a crank with a square hole must be mounted on a BB with the square receiver).
Bottom brackets also come in different widths, and with different spindle widths: the bracket width should match the frame, and the spindle width should put the cranks out away from the frame, and allow the front derailleur to transfer the chain onto the smallest ring without hitting the bike frame. The BB will usually have its size printed on the cartridge, but you have to take it out to read the numbers. For example, a 68x116 bottom bracket is 58 mm wide as it fits into the frame, and the spindles are 116 mm apart. If you wanted the pedals a bit closer together, you might buy a 68x112.5 BB.
Sealed Bottom Bracket: If your bottom bracket is a sealed cartridge unit (as most are nowadays), it can't be serviced or adjusted. If it grinds, wobbles, or catches, it must be replaced as a unit. Just remove the old cartridge and replace the entire thing.
Take the chain off the chainrings, and lay it on the frame next to the bottom bracket. With the bike clamped in a workstand, shove the base of the crank-arms side-to-side to detect motion in the bottom bracket. Now try to pull the cranks away from, then back towards the bike to detect wobble. Turn the crank and listen for noises within the bottom bracket. These tests will help you identify a damaged bottom bracket.
To replace the bottom bracket, you have to do some major stripping! You must remove both the left crank and the right crank arm plus chainrings. See the crank section for additional information.
PLEASE click on the link directly for more help
http://www.utahmountainbiking.com/fix/bracket.htm
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Apr 02, 2010 | Ford F-150 Cars & Trucks

2 Answers

The crank arm is stripped on the left side of the bike


Yes, the crank-arm could be replaced.
1.You would need to remove the flat nut holding the crank to the frame. And then take out the bearing.
2. A special open-ended wrench is required to remove this nut. Please visit your local bicycle shop for a new crank-arm, and the required tools, also.
3. Put in new crank-arm and its bearing.
4. Grease the bearing.
5. Tighten nut.
6. Give it a test ride.

Dec 10, 2009 | Schwinn Mesa Gs Mountain Bike

1 Answer

How do I remove a crank arm from a Huffy Mountain bike?


You will need to purchase a crank puller. If you only have to do this once you are better off having it repaired in a bike shop unless you like to have tools for everything. They come in various sizes so you will have to tell the dealer which one you need and for what bike. It works like a gear puller. You remove the cap covering the bolt. You remove the bolt or nut holding the crank on and screw the puller into the threads on the crank. You then tighten the bolt that goes through the center of the puller. It puts pressure on the bolt in the center of the crank and forces the crank off. Hope this helps.

Jul 04, 2009 | Cycling

1 Answer

How to disassemble crank bearing on Schwinn Mesa Mountain Bike


You wil need a couple of special tools, or be fairly creative with the tools you have.
  1. remove the dustcovers in the crank arms at the crank axle
  2. loosen the crank retaining nut/bolt.
  3. thread in a chank puller and pull the crank arms.
  4. remove the lock ring on the adjustable side of the crank axle (Requires lock ring wrench)
  5. remove adjustable bearing cup.
  6. remove axle and bearings
  7. replace or repair as needed.
Once you have it opened up ou can determine if you need new bearings or crank axle.
to assemble, reverse above procedure, insuring bearing play is minimalized.

Hope this helps.
Ed

Apr 16, 2009 | Schwinn Mesa Gs Mountain Bike

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