Question about Diamondback Octane Jr Boy's Mountain Bike (20Inch Wheels)

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Have a Diamondback Octane 20 (boys). Took the rear tire off to install a new inner tube. Don't know what happened...but now I can't get the chain back in place. Seems all twisted but I know that's impossible because it can't come off the bike. I need some step by step instructions on how to install a chain so maybe I can figure out where I'm going wrong. Thanks.

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Even though chains seem like the can't get twisted, they still can. Rivets in the individual links can become bent, and the links themselves can become bent as well. Also, your chain can be removed, and its a simple process. Although, getting the chain back on sometimes is an excercise in futility.

To remove your chain it's easiest to turn your bicycle upsiode down so that it's resting on the handle bars and the seat. Now you need to look for the master link. This link has a different shape than the other links. This link is designed to snap into place. However, it can be snapped apart for jus this type of scenario. Often, most links resemble an 8. And just as often, the master link is a simple oval shape. Once you have found that master link, use a pair of flathead screwdrivers and pry the link apart. Now that chain is apart, you can easily remove the chain from the bicycle and straighten it out. This will often remove any odd kinks in the chain itself, but be sure you look the chain over for any signs of link damage.

Happy pedaling!

Posted on Mar 23, 2011


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Make sure that the tire and the crank sprockets are "in line" (the same plane). If the wheel is not lined up straight, the chain will easily fall off. If you have a bicycle with gears, you'll want to be sure that the derailleur is tweaked correctly too.

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If you have the right spanner wrenches and a freewheel removal tool and chain whip you can repair it yourself, but if you had those tools then you probably wouldn't have posted here. So your best bet is to take it to the local bike shop to have the hub overhauled. There are many different size axles and they will need to see it and make sure to order the right length and size, plus you will probably need new bearings. You are looking at about $10-20 in parts and about $10-20 in labor. Most bike shops can sell you a complete new wheel (minus the tire, tube, rimstrip, and rear cogs) for about $40 and up that would be in the Sorrento quality range. Usually we see broken rear axles when the bike has been jumped and if the force was great enough to break a hard steel axle, it probably flattened a portion of the soft aluminum rim too (not always, but I'm just saying what typically happens) so perhaps just buying a new rear wheel is the most cost effective fix and quickest too. If the LBS has the wheel you need in stock they can swap it out in a matter of minutes versus waiting a week or more for parts to come in from a supplier and the hour plus it would take in labor to rebuild the hub.

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I need to know how to change a back inner tube on a 16" huffy bike no gears

Sue, there are lots of how-to videos out there about this. Just google "How to change bike tube" or tire, or flat. You have to remove the wheel, which is easiest with TWO wrenches - they can be the adjustable "Crescent" wrenches, but don't use pliers. You also have to remove the small screw that holds the fat little L-shaped lever to bike. Use a rag to remove the chain from the cog on the wheel. Then use the little "Tire irons" to remove the tire from the rim and get the old tube out - these come three to a set, the plastic ones are best, and you can get them at K-mart. Also, use some baby powder (talc is better than cornstarch) to make the new tube easier to position correctly in the tire - sprinkle the powder inside the tire when you have if off and put the tube in the tire before you put the tire back on the rim. It helps if you put a little air in the tube to make it a nice sausage first. And make sure you get the valve stem straight and pulled all of the way through the hole in the rim. Be very careful that you don't pinch the tube against the rim when you put the tire back on. And the hardest part might be getting a pump to hold tight onto the valve stem - using compressed air (like at a gas station) is by far the easiest method. Good luck.

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We have the 20 inch Huffy seastar and the tires wont hold air, Do I need a new tube? and if so where can I buy them


Sounds like you may need new tubes. Tubes may be purchased from bike shops, most hardware stores, and some big box retail stores like Kmart and Target, to name a few.

If the leaks in the tubes are reasonably small, there are several products that can be squeezed into the tubes to seal punctures - both existing ones and ones that occur after the product is added. They are put into the tube through the valve stem, similar to adding air). Two that I know of are Fix-a-Flat and Slime. Both can be purchased at most hardware and automotive stores.

Changing a tube is not terribly difficult but can appear daunting if you've never done it before and don't have some of the tools required.

Hereare step-by-step instructions for most styles bicycle:
  1. Loosen thenuts that hold the axle to the frame.If they are extremely tight, spray some lubricant on the nuts - a siliconelubricant or even vegetable oil will do the trick.
  2. Take thewheel out of the frame. If it's therear wheel, you will need to lift the chain clear of the gear cluster. To easethe removal of a rear wheel, shift the chain to the smallest gear on the wheelbefore loosening the skewer or nuts. If it's the front wheel, that one will bea little easier. You may also need to release the brakes if they interfere withwheel removal.
  3. Deflate thetube completely by pressing down on the inner part of the valve.
  4. Take acouple of tire levers (you can purchase these at your local bike/outdoor store). You can use the handle of a spoon or similarobject if you don't have tire levers but be very careful, as you riskscratching or damaging the rims of the wheel and/or puncturing the inner tube.Ease one lever in under the wheel rim and lever out the edge of the tire(taking great care not to puncture the inner tube) and pry it up over the wheelrim. Move around the rim about an eighth of the circumference and repeat theprocess again, leaving the first tool in place. Now zip the second lever aroundthe wheel and the tire should come right off on one side.
  5. Remove thewheel and tube completely.
  6. Replace theinner tube
  7. Check thetire wall for an arrow or similar to indicate the direction of rotation - sometires have a "direction specific" tread pattern.
  8. Put one sidein first, then ease the partially inflated tube into the tire and locate thevalve in the hole in the rim.
  9. Starting atthe tire edge closest to the valve, use your thumbs to work the other side oftire over the rim and into well.
  10. Beforeinflating, use your thumbs again to ease the tire from the rim all around the circumference,peeking in to make sure that the tire is not pinching any part of the tubeagainst the rim. When youinflate the tube, if it is pinching, it will pop, and you will have to repeatthe entire process, and buy a new tube.
  11. Inflate thetube,checking to make sure the tireis on evenly and there is no "pinching".
  12. You're now ready to put the wheel back on the bike.
Hope this helps.



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A bike shop may be able to help you. Maybe you could just repair the tube with a tube repair kit, available anywhere bicycle accessories are sold.

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