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Advice on replacing old MTB chainrings
I've worn out the middle ring on my old Bridgestone MB-3, and after
also just replacing my rear cassette, I'm thinking I'll just replace all the rings at once. This is a 24-36-46 ring set, 110mm/74mm bolt pattern, 7 speed. The original rings are Shimano SG "C". It looks like I can get flat aluminum replacements (Salsa or Sugino) for roughly $20+$20+$30 from various sources. I can substitute the middle and outer rings with Shimano SG-X rings for an extra $20. I think I'd prefer those for smoother shifting. Anything else I should consider here? I think the SG-X rings are 7-speed compatible? -- Dave |
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Advice on replacing old MTB chainrings
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Advice on replacing old MTB chainrings
"(PeteCresswell)" wrote in message ... Per : Anything else I should consider here? Consider the intended use of the replacement ring. I suspect that some rings are designed for multi-ring applications and others aren't. The Salsa I have on one of my bikes looks tb designed for a single-ring setup. On my other rings there are various little sculpted areas that look to me like they're designed to facilitate the chain moving from one ring to another. Maybe somebody who actually knows something can chime in here. -- PeteCresswell Get a "ramped" chainring for smooth shifting. |
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Advice on replacing old MTB chainrings
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Advice on replacing old MTB chainrings
Check the auction site for NOS new old stock complete cranks.
I picked up an new old 7 speed Deore crank perfect match to my Trek MB. Much cheaper than the rings and shifting is perfect. Here is one but it ends soon. http://cgi.ebay.com/ws/eBayISAPI.dll...tem=7173645292 On Mon, 08 Aug 2005 19:50:15 GMT, wrote: I've worn out the middle ring on my old Bridgestone MB-3, and after also just replacing my rear cassette, I'm thinking I'll just replace all the rings at once. This is a 24-36-46 ring set, 110mm/74mm bolt pattern, 7 speed. The original rings are Shimano SG "C". It looks like I can get flat aluminum replacements (Salsa or Sugino) for roughly $20+$20+$30 from various sources. I can substitute the middle and outer rings with Shimano SG-X rings for an extra $20. I think I'd prefer those for smoother shifting. Anything else I should consider here? I think the SG-X rings are 7-speed compatible? -- Dave |
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Advice on replacing old MTB chainrings
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Advice on replacing old MTB chainrings
The Quiet Man wrote:
Check the auction site for NOS new old stock complete cranks. I picked up an new old 7 speed Deore crank perfect match to my Trek MB. Much cheaper than the rings and shifting is perfect. Here is one but it ends soon. http://cgi.ebay.com/ws/eBayISAPI.dll...tem=7173645292 I'd tried looking for chainrings on ebay but not whole crank sets. I'm not sure about dealing with chainline issues if I replace the whole crank set, and I didn't see any current listings that looked like a close match to my existing crank. - Dave |
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Advice on replacing old MTB chainrings
Paul Kopit wrote:
You can buy a crankset and throw away or sell the crankarms http://store.airbomb.com/ItemDesc.asp?IC=CR1033 That's not a bad idea. Though the inner ring is only a 26, and swapping that would wipe out much of the savings. Any opinion on steel vs aluminum alloy chainrings (i.e. XD300 @ $47 vs XD600 @ $71?) Also these cranks have one bolt aligned with the crank arm rather than offset as with my existing crank; is that any cause for concern (i.e. does it mean the ramps/pins will be mispositioned if I swap rings?) I haven't seen any online catalogs with individual Sugino chainrings with ramps/pins. The sold-separate rings seem to always be the "flat" ones. -- Dave |
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Advice on replacing old MTB chainrings
-----BEGIN PGP SIGNED MESSAGE-----
In article , (PeteCresswell) wrote: Per : Anything else I should consider here? Consider the intended use of the replacement ring. I suspect that some rings are designed for multi-ring applications and others aren't. The Salsa I have on one of my bikes looks tb designed for a single-ring setup. _ I would say any ring that is 3/32" is "designed" for a multi-ring setup. The Salsa rings don't have pins and ramps, but they do work with 3/32" chain. The key difference is indexed vs non-indexed. Indexed front derailler shifters need the extra help from the pins and ramps, since you can do the slight overshift that you would with a friction shifter. On my other rings there are various little sculpted areas that look to me like they're designed to facilitate the chain moving from one ring to another. _ If he has indexed front derailler shifting, then the various ramps and pins are most like neccessary for proper shifting. If it's just a thumbshifter then the ramps aren't needed. If you poke around you can get a complete set of RaceFace 24-34-46 chainrings for 110/74 cranks for about $80 bucks[1]. They say 9-speed but will work just fine with any speed and have all the ramps and pins. _ Of course, you can get a Sugino XD crank and appropriate shimano square taper BB for pretty close to $80. If the original bike has a cartridge BB, then if the chainrings are really worn out, it might be time to replace the BB as well. _ Booker C. Bense [1]- Try Cambria Bike Outfitters or Performance. -----BEGIN PGP SIGNATURE----- Version: 2.6.2 iQCVAwUBQvjq1mTWTAjn5N/lAQHw5gP+PhpC4EGkQv+kbZGmCJblKPKbKOP4uk3M fzYzYuOg6+lESqr+xcnDE2dKsJokLHKB00g3i2AcYrHa0g2yVw y5VQKnbz56msbw bYFrcYNxGMaJ72Y1B9W5eGYhK35dtQ052KIjVn0myIHfryDDbg hBQjR/3EzQrM/5 YxVQoKlKpPQ= =3/T6 -----END PGP SIGNATURE----- |
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Advice on replacing old MTB chainrings
Booker C. Bense . stanford.edu wrote:
_ If he has indexed front derailler shifting, then the various ramps and pins are most like neccessary for proper shifting. If it's just a thumbshifter then the ramps aren't needed. If you poke around you can get a complete set of RaceFace 24-34-46 chainrings for 110/74 cranks for about $80 bucks[1]. They say 9-speed but will work just fine with any speed and have all the ramps and pins. I do have a friction thumb shifter for the front, but still prefer the ramped chainrings that came with the bike. I've already replaced the middle ring once with a cheap flat ring and was never happy with the shifting after doing so. _ Of course, you can get a Sugino XD crank and appropriate shimano square taper BB for pretty close to $80. If the original bike has a cartridge BB, then if the chainrings are really worn out, it might be time to replace the BB as well. I swapped out the original non-cartridge BB for (I think) a UN72 a couple years ago. [1]- Try Cambria Bike Outfitters or Performance. Performance has a surprisingly lousy selection of chainrings in their catalog. I had not looked at Cambria before but they seem to be much better. Cambria has SUN Ringle alloy chainrings for very low prices: $45 total for a 24-36-46 set. The web page claims these are ramped but I can't tell that from the photo and can find little information about them online. -- Dave |
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