He must be heavy for a chain to slip,it sounds like it needs oil on the chain or a cog is worn down but I would say oil the chain good will fix it
If you are unsure of the chain size the best thing is to have a local shop replace it for you. If you decided to donut yourself, make sure you have a chain tool to match the link count. Don’t go by chain length because the original chain stretches depending on age and how hard you pedal.
No, you don't need to contact the manufacturer. There are two possible solutions. First, if the chain is sized one full link (inner+outer) too long it can just be shortened. The other option is a new chain (made for 5 gears in back) but a new chain will not always mesh with the gears if the bike has a lot of miles on it, especially if the small gears in the back have been ridden a lot. Either way I would really suggest you get some local help, as sizing and installing a chain requires both knowledge and a specialized tool.
SOURCE: The chain wants to jump off while trying to change gears
There are several things that could be wrong:
Shifter out of adjustment
Chain worn
Chain and gear(s) worn
Shifter out of adjustment:
Try adjusting the cable tension by turning the barrel (the part between the cable and the shifter). Count the number of turns and reset it to its original position if this doesn't solve it.
Chain worn:
Chains wear out. hold a ruler up to it, with one end centered on a pin. 12" away, another pin should like up very very very close to the 12" mark. If not, it's probably worn out and needs to be replaced. No way around it. Some say chains are good for 500 miles only. Your mileage may vary. (keep reading...)
Chain worn and gear(s) worn:
If the bike has been ridden witha worn chain for a while, it will make the gears in the back wear faster too, and a new chain alone will not work. If this is the case, you need a new chain and new gears in the back. Often, gears in the back are replaced all at once in a 'cassette'. You'll have to make sure your front gears aren't worn out too!
SOURCE: Need to adjust the gears on 18 speed Next
Since you don't specify the make or model a manual is not likely to be recommended for you. However, gears adjustments are sort of generic within limits. Try this link and find your shifters...
http://parktool.com/repair/byregion.asp?catid=53
SOURCE: Chain slips when in 7th
Hi.
If the chain slips when the bicycle is in high gear you need to align the rear derailleur hanger. See the picture below:
See this tutorial links:
rear derailleur video
derailleur-hanger-alignment
How to Check a Bike
SOURCE: Chain Broke on a Huffy
if the bike has gears it does not have a master link, that is for single speed bikes only.
You will need an 8spd chain for your bike (1/2" x 3/32), these will fit any 6,7 or 8 spd bike. This requires a special tool to install ($8-$25), I would recommend taking into a bike shop and have them do it if you have no experience with this type of chain.
Side note: if you do own the tool, you can repair a broken chain for a temporary fix in the future, so may be worth buying. Check around, many bike shops offer basic repair classes and cover this.
SOURCE: chain placement on Next 21 gear mountain Bike
You haven't actually asked a question, so I am guessing that you want to know how to replace a bicycle chain on a 21 speed bike. To remove the chain you need to use a chain tool that presses one of the pins out of the one of the chain links (any link, there is no master link). To put the new chain on you use the chain tool to press the pin in. This is just a little tricky with a chain tool, but it's just about impossible without it. They sell these tools at bike shops and maybe even at Wal-mart. Take a look at this link to see a what I'm talking about. http://www.parktool.com/blog/repair-help/chain-installation-derailleur-bikes By the way, Park tools are very good quality for the money.
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