Question about replacement chainrings
08-26-16, 03:14 PM
#1
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Question about replacement chainrings
I have question about chainrings.
I want to replace my current chainrings (46t/36t) with newchainrings (53t/39t).
When looking at chainrings for sale on Ebay, some are listedas “B-type”. To what does that refer andwhat is the difference between this type and any other type?
Thanks in advance for any info…
I want to replace my current chainrings (46t/36t) with newchainrings (53t/39t).
When looking at chainrings for sale on Ebay, some are listedas “B-type”. To what does that refer andwhat is the difference between this type and any other type?
Thanks in advance for any info…
08-26-16, 03:41 PM
#2
Non omnino gravis
Generally, 53/39 will be on 130BCD cranks, "standard" while 46/36 and others will be on 110BCD, "compact." There are some 53/39 for 110BCD, but not many. Your easiest route, short of replacing the entire crankset, is to go for the 52/36 "mid-compact" chainrings. Lots of options in 110BCD. Or alternately, just buy a whole 53/39 130BCD crankset on eBay for cheap-- every is selling them, because so few people run those big gears anymore.
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08-26-16, 03:53 PM
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To answer your question, Shimano chainrings are "ramped and pinned" to facilitate shifting.
Scroll down for Sheldon Brown's description; saves lots of typing:
https://www.sheldonbrown.com/gloss_ra-e.html
The B designation is so you can match them up as they were designed to be, but it doesn't hurt anything if you mix them up...
Scroll down for Sheldon Brown's description; saves lots of typing:
https://www.sheldonbrown.com/gloss_ra-e.html
The B designation is so you can match them up as they were designed to be, but it doesn't hurt anything if you mix them up...
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