Is there a ramped and pinned 33T 5-bolt 110mm BCD Chainring?
The 110mm BCD should support a 33T chainring but I've been having trouble finding one. T.A. Specialities makes a 33T 5-bolt 110mm BCD but their only version of it isn't ramped and pinned. Does anyone know of a company that makes a 33T ramped and pinned? The setup I'm trying to put together is marginal enough that the difference between 33T and 34T actually does matter for front derailleur clearance.
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Since the general lower limit for ring teeth on a 110 is 34T consider it fortunate that someone has offered anything less then 34T. The day of ring selection by each tooth has gone years ago. Just like with cog sets, the economics of a wide selection of tooth counts for each position just don't make business sense to most every company in this business. Andy
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Is this for a Double chainring setup? If so, there is no need for ramps and/or pins on the small chainring.
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Originally Posted by dsaul
(Post 21289938)
Is this for a Double chainring setup? If so, there is no need for ramps and/or pins on the small chainring.
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Originally Posted by dsaul
(Post 21289938)
Is this for a Double chainring setup? If so, there is no need for ramps and/or pins on the small chainring.
Originally Posted by delbiker1
(Post 21289947)
I have found this to be true, and they are less money then ramped and pinned rings. I have them on my triple, middle and small, also.
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Originally Posted by williaty
(Post 21289977)
It's a triple and the granny-middle shift is huge, prompting me to want the ramps and pins for every little advantage I can get. If everything works out, I'm going to be running a 17-33-44 triple with a 13-42 10spd cassette.
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Originally Posted by HillRider
(Post 21289998)
Wow, that's 56 total teeth! Your going to need a hose reel for a rear derailleur to wrap up all that chain. Assuming 700c wheels that's an 11 gear-inch low gear. Do you really need that low a gear or is this for a trike?
26" rear wheel so I'm looking at about ~10.5 gear inches, which isn't unusually low for loaded touring in a recumbent tadpole trike. I currently have a 22T granny wit the 42T cog in back and it's nowhere near low enough. |
Originally Posted by HillRider
(Post 21289998)
Wow, that's 56 total teeth!
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Originally Posted by JohnDThompson
(Post 21290149)
+1 this. Ramps and pins are irrelevant if this is the innermost ring.
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Originally Posted by williaty
(Post 21290151)
You missed the earlier replies where I did in fact clarify that this is for the middle ring of a triple.
But still, ramps and pins are really only an issue if you are using indexed front shifting. Are you? |
Originally Posted by JohnDThompson
(Post 21290158)
Yes, you're right.
But still, ramps and pins are really only an issue if you are using indexed front shifting. Are you? |
This has a 2.5:1 reduction capability: rehab drive - schlumpfdrive - ultraflat Planetary Gear for Bikes
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I'm not convinced a "shadow" derailleur is hurt by running a short chain. I've hit it once on a bike, and it simply failed to jump up. Of course, if one does catch the chain, one might rip the chain apart of one puts too much power in.
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Originally Posted by dsbrantjr
(Post 21290166)
This has a 2.5:1 reduction capability: rehab drive - schlumpfdrive - ultraflat Planetary Gear for Bikes
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SPA cycles has 33T inner/middle chainrings that have ramps and pins. I've tried the 46T and it shifts pretty well. I cannot remember whether the thickness was 4mm or 4.5mm.
https://www.spacycles.co.uk/m2b0s210...l-Middle-Inner |
Originally Posted by williaty
(Post 21290004)
26" rear wheel so I'm looking at about ~10.5 gear inches, which isn't unusually low for loaded touring in a recumbent tadpole trike. I currently have a 22T granny wit the 42T cog in back and it's nowhere near low enough.
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Originally Posted by HillRider
(Post 21290457)
OK, that's what I thought and I understand that a for a trike there is no such thing as too low a low gear. BTW, there are cassettes with 50 and 52T big cogs intended intended for 1X deivetrains but should work for your purposes. Your current 22T granny with a 52T cog gives the same 11 gear-inch low.
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Originally Posted by tomtomtom123
(Post 21290385)
SPA cycles has 33T inner/middle chainrings that have ramps and pins. I've tried the 46T and it shifts pretty well. I cannot remember whether the thickness was 4mm or 4.5mm.
https://www.spacycles.co.uk/m2b0s210...l-Middle-Inner |
Originally Posted by williaty
(Post 21290164)
No, friction bar ends. However, the size of the planned jump means that ramps and pins will help it be easier to climb up 16T in a single lift vs just smashing the crap out of the chain sideways and hoping it works.
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Originally Posted by JohnDThompson
(Post 21290504)
Friction shifting shouldn't have a problem with a 16T jump. A slight overshift to move the chain, followed by trim should become second nature with a little practice.
As to slack chain, Rohloff makes a chain tensioner for use on bikes with vertical dropouts. Could you adapt it to your trike? |
I'll add that creating a "W" cut ring teeth gate is pretty easy and can help a non pinned/ramped ring shift better. But most people are afraid of taking a file to a new ring. Andy
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Originally Posted by JohnDThompson
(Post 21290504)
Friction shifting shouldn't have a problem with a 16T jump. A slight overshift to move the chain, followed by trim should become second nature with a little practice.
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I've wanted to try a triple with something like this: https://www.ebay.com/itm/NEW-mircoSH...0AAOSwCmBdzGxA
Maybe not enough for that small a granny, but might just work with a triple+wide range cassette. It is meant to work with a double though. |
I neglected to ask earlier but where are you getting a 17T granny chainring and what's it's bolt circle? Is it a repurposed cassette cog? The smallest real chainring I've ever seen is 20T but I've seen adapters that allow the use of a rear cog as a chainring.
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Originally Posted by HillRider
(Post 21291878)
I neglected to ask earlier but where are you getting a 17T granny chainring and what's it's bolt circle? Is it a repurposed cassette cog? The smallest real chainring I've ever seen is 20T but I've seen adapters that allow the use of a rear cog as a chainring.
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