Buying replacement parts
04-21-20, 07:31 AM
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Buying replacement parts
Hello,
I need some help buying replacement parts for my wife's bike. She has a 2008 Marin Kentfield FS 19 inch bike (see link below).
Her chain snapped and the crankset is rusty so I was looking to replace both. I can't seem to find the exact parts listed from the website so I was hoping someone can point me in the right direction for the closest equivalent parts that are available for purchase.
Link for the bike
www dot rei dot com /product/762217/marin-kentfield-fs-bike-2008
Parts I'm looking to replace:
Crankset SR Suntour NEX, 48/38/28
Chain UG5
Thanks
Mike
I need some help buying replacement parts for my wife's bike. She has a 2008 Marin Kentfield FS 19 inch bike (see link below).
Her chain snapped and the crankset is rusty so I was looking to replace both. I can't seem to find the exact parts listed from the website so I was hoping someone can point me in the right direction for the closest equivalent parts that are available for purchase.
Link for the bike
www dot rei dot com /product/762217/marin-kentfield-fs-bike-2008
Parts I'm looking to replace:
Crankset SR Suntour NEX, 48/38/28
Chain UG5
Thanks
Mike
04-21-20, 08:47 AM
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Any 6-7-8 speed chain (KMC, SRAM, Shimano) will be fine.
It appears your crank uses a square taper 122mm bottom bracket. Unless you get another that uses the same length and interface, you'll also need to replace the bottom bracket with the correct length for the new crankset.
New Crankset should be close to the same gearing and crank arm length.
You'll need a crank removal tool, chain tool, and if replacing the BB whatever tools are required to remove the old and install the new.
It appears your crank uses a square taper 122mm bottom bracket. Unless you get another that uses the same length and interface, you'll also need to replace the bottom bracket with the correct length for the new crankset.
New Crankset should be close to the same gearing and crank arm length.
You'll need a crank removal tool, chain tool, and if replacing the BB whatever tools are required to remove the old and install the new.
04-21-20, 08:51 AM
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First consider replacing the cog set too as new chains and old cog teeth often don't like each other.
Second It's quite possible to match the crank with another model/brand as long as the BB axle length suggested matches the BB you currently have. If not then a replacement BB would handle that aspect, maintaining the chain line. Of course even with an exact same crankset expect to need to do some fine tuning of frt der adjustments.
Chains are pretty interchangeable if the chain width (or intended number of rear cogs) is kept the same. We like the SRAM PC830 for a relatively low cost and well working 7 speed chain.
BTW thanks for including a written out link to the bike. You are already either smarter or better motivated then some first time posters we see. Andy
Second It's quite possible to match the crank with another model/brand as long as the BB axle length suggested matches the BB you currently have. If not then a replacement BB would handle that aspect, maintaining the chain line. Of course even with an exact same crankset expect to need to do some fine tuning of frt der adjustments.
Chains are pretty interchangeable if the chain width (or intended number of rear cogs) is kept the same. We like the SRAM PC830 for a relatively low cost and well working 7 speed chain.
BTW thanks for including a written out link to the bike. You are already either smarter or better motivated then some first time posters we see. Andy
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AndrewRStewart
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04-21-20, 09:54 AM
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If you want to keep the amount of work and money at a minimum you might consider just replacing the chain after knocking the rust off of the crankset and cogset. Surface rust does not always necessitate replacement. If the gears are not heavily worn (the OP does not state how much use the bike has had) they may not need to be changed. If the chain does not skip on the old gears you are done.
04-21-20, 10:40 AM
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SR Suntour XR-T will fit for around $30. Need to find out crank arm length 170/175).
14-28 7 speed might be a freewheel rather than a cassette. Need to find out, but Sunrace/Shimano freewheel or 13-28 cassette will work for around $20 or so.
A new chain Sram 830 for $15.
John
14-28 7 speed might be a freewheel rather than a cassette. Need to find out, but Sunrace/Shimano freewheel or 13-28 cassette will work for around $20 or so.
A new chain Sram 830 for $15.
John
04-21-20, 10:56 AM
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I'd also suggest trying to free up the existing cranks with a dishwashing scouring pad or a wire brush (even a BBQ cleaner brush) and more WD40 and the rust should come right off. Then if it all frees up, use a thicker oil on the chain and wipe a thin coat of oil on the cranks where it was rusty and hopefully you'll be good to go.
If the bike is rusty, there's a good chance the brake and gear cables have also gummed up in the housings which makes braking and gear shifting bad. Either get some oil on the cables by dripping it down the ends or (better) remove the cables and oil them or even replace them.
Be aware if you get a new chain, you will need a chain removal tool and it's very possible you'll need to change the rear gear freewheel as well (a Shimano, 14-28, 7-speed) which is another special tool.
If the bike is rusty, there's a good chance the brake and gear cables have also gummed up in the housings which makes braking and gear shifting bad. Either get some oil on the cables by dripping it down the ends or (better) remove the cables and oil them or even replace them.
Be aware if you get a new chain, you will need a chain removal tool and it's very possible you'll need to change the rear gear freewheel as well (a Shimano, 14-28, 7-speed) which is another special tool.
