Shimano Biopace 48 Tooth, 110 mm Chain Ring
03-02-10, 10:16 PM
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Shimano Biopace 48 Tooth, 110 mm Chain Ring
Does anybody know where I can find one of these Chainrings? I have an old beater mountain bike, and the large ring is worn out.
I found the following ring in a 48 teeth, 110 mm:
Origin8 BMX Chainrings $17.95
Will this work as a replacement?
I found the following ring in a 48 teeth, 110 mm:
Origin8 BMX Chainrings $17.95
Will this work as a replacement?
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03-02-10, 10:19 PM
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Any standard round chainring will work. If you're looking for the *exact* biopace ring, you'll have to try the secondary/used market for that.
03-02-10, 10:21 PM
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Biopace chainrings haven't been made in 20 years. You could get lucky and find one on Ebay.
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03-02-10, 10:31 PM
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Thanks for that. It looks like these are fairly easy to install. Remove 5 Allen-Head screws, and install new ring. Am I oversimplifying?
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03-02-10, 10:41 PM
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These U.S. made 6061 T6 chainrings (formerly Rocket Rings) are a great value, and ideal for use for fixed-gear road conversions.
They are thicker and stiffer than most road rings, but they work with either wide or narrow chain.
Double set of mounting holes means they fit either 110 mm or 130 mm bolt circle cranks!
They have tall teeth to prevent accidental derailment, and are a great choice for singlespeed or fixed-gear bikes, though they will generally also work with derailers.
Available sizes: 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48
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03-02-10, 11:45 PM
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03-03-10, 12:05 AM
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The March dealers catalogue of J&B Importers page 105 -- Origin 8 BMX/SS/FIXIE chainrings -- 6061-T6 alloy construction ...... Great for BMX,Fixie or Cruiser application. It states 1/2 & 3/32 chain compatible in black ( part # 22410) or silver (part #21717). Origin 8 offers 1/2 & 1/8 compatible as well so make sure you get the right one --- the first time.
03-03-10, 12:44 AM
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https://www.biketoolsetc.com/index.cg...tem_id=PA-CNW2
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03-03-10, 01:16 AM
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Back in the day Shimano would supply their version (which I still use) of the the slotted chainring bolt holder (and crank dust cap installer/remover) free with their cranks (maybe only with the DA cranks -- but they where free).
03-03-10, 10:39 AM
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03-03-10, 10:45 AM
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.
Hi,
.
I beg to differ. It was NOT a gimmick and they DO work. I've
got them on four mid-'80s bikes and they're great on rolling
hills and knee savers too, just like the late Sheldon Brown
claimed at:
.
https://sheldonbrown.com/biopace.html
.
And they are nearly always available on eBay, in pairs and
singles, in alloy and steel, in 130bcd and 110bcd.
.
But if the OP goes round, he ought to go round for both
rings, not just one. Sheldon's article will tell him why.
.
Hi,
.
I beg to differ. It was NOT a gimmick and they DO work. I've
got them on four mid-'80s bikes and they're great on rolling
hills and knee savers too, just like the late Sheldon Brown
claimed at:
.
https://sheldonbrown.com/biopace.html
.
And they are nearly always available on eBay, in pairs and
singles, in alloy and steel, in 130bcd and 110bcd.
.
But if the OP goes round, he ought to go round for both
rings, not just one. Sheldon's article will tell him why.
.
I have over 60K miles on it. It was my primary commuter to work for about 16 years. I rode it year-round in snow, rain, ice, etc. I've replaced this chainring once already, but back then, the bike shop had a used spare. I'm a little attached to it. We've been through a lot together!!!
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Jim
Make a BOLD Statement While Cycling!
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03-03-10, 12:26 PM
#13
Senior Member
.
Hi,
.
I beg to differ. It was NOT a gimmick and they DO work. I've
got them on four mid-'80s bikes and they're great on rolling
hills and knee savers too, just like the late Sheldon Brown
claimed at:
.
https://sheldonbrown.com/biopace.html
.
And they are nearly always available on eBay, in pairs and
singles, in alloy and steel, in 130bcd and 110bcd.
.
But if the OP goes round, he ought to go round for both
rings, not just one. Sheldon's article will tell him why.
.
Hi,
.
I beg to differ. It was NOT a gimmick and they DO work. I've
got them on four mid-'80s bikes and they're great on rolling
hills and knee savers too, just like the late Sheldon Brown
claimed at:
.
https://sheldonbrown.com/biopace.html
.
And they are nearly always available on eBay, in pairs and
singles, in alloy and steel, in 130bcd and 110bcd.
.
But if the OP goes round, he ought to go round for both
rings, not just one. Sheldon's article will tell him why.
.
03-03-10, 12:45 PM
#14
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I'm always a little perplexed by this,
Some people like biopace, some people don't. If you like it, ride it. If you don't, don't.
That's really all there is to it.
Some people like biopace, some people don't. If you like it, ride it. If you don't, don't.
That's really all there is to it.
03-03-10, 02:10 PM
#15
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.
Hi Jim,
.
Good to hear you found your 48T 110bcd BP ring so fast.
.
I wonder if Fort Collins still has it 3.2% beer halls for
CSU and other under 21 year olds? It was the fall of 1963
when I popped down from Laramie (not even 3.2% there) to
tip a few with some WyoU basketball players. They got drunk
but I was driving so didn't but got thrown in the local
lockup anyway for "disorderly conduct" (watching a street
fight).
.
Hi Jim,
.
Good to hear you found your 48T 110bcd BP ring so fast.
.
I wonder if Fort Collins still has it 3.2% beer halls for
CSU and other under 21 year olds? It was the fall of 1963
when I popped down from Laramie (not even 3.2% there) to
tip a few with some WyoU basketball players. They got drunk
but I was driving so didn't but got thrown in the local
lockup anyway for "disorderly conduct" (watching a street
fight).
.
__________________
Jim
Make a BOLD Statement While Cycling!
Jim
Make a BOLD Statement While Cycling!
03-04-10, 06:36 AM
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i have a handful of biopace rings, along with a couple of other makers who put out those shape rings under different names, in fact I think I just tried to mount a BP ring to a bmx, no chain tensioner ment the chain went tight, slack, tight, slack....oh well no 48 teeth for my bmx I guess...
03-04-10, 09:30 AM
#17
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.
I suppose I have a record. I pleaded "guilty with an
explanation" (ie. it wasn't me but another guy yelling, which
was true) and the judge retained my $10 bail as a fine.
.
The US Army didn't mind. They sent my to Artillery OCS, then
to Fort Carson (down the road a piece from Ft. Collins)
and made me assistant operations officer for a nuclear-
capable 8" Howitzer battalion. They even taught me how to
assemble an 8" nuclear round!
.
Just the sort of responsibility that should be given an
ex-con. Right?
.
I suppose I have a record. I pleaded "guilty with an
explanation" (ie. it wasn't me but another guy yelling, which
was true) and the judge retained my $10 bail as a fine.
.
The US Army didn't mind. They sent my to Artillery OCS, then
to Fort Carson (down the road a piece from Ft. Collins)
and made me assistant operations officer for a nuclear-
capable 8" Howitzer battalion. They even taught me how to
assemble an 8" nuclear round!
.
Just the sort of responsibility that should be given an
ex-con. Right?
.
__________________
Jim
Make a BOLD Statement While Cycling!
Jim
Make a BOLD Statement While Cycling!
03-04-10, 09:31 AM
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i have a handful of biopace rings, along with a couple of other makers who put out those shape rings under different names, in fact I think I just tried to mount a BP ring to a bmx, no chain tensioner ment the chain went tight, slack, tight, slack....oh well no 48 teeth for my bmx I guess...
__________________
Jim
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Jim
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03-04-10, 01:41 PM
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I believe the 110mm is the diameter of the circle formed by the bolt holes (unless one of the more informed can tell me otherwise). Since there's 5 holes, you can't measure, hole to hole. Instead, you have to kind of eye it with a ruler. Unless you want to draw a circle. You get the point.?.?
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Jim
Make a BOLD Statement While Cycling!
Jim
Make a BOLD Statement While Cycling!
03-04-10, 02:05 PM
#21
Bicycle Repair Man !!!
For the OP - will take a look and see what I have kicking around the shop and take a look at our co-op for you.
Think I only have larger road rings at my shop as I use them of ss and fixed gear bikes.
03-04-10, 05:12 PM
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.
Hi Jim,
.
I wonder if Fort Collins still has it 3.2% beer halls for
CSU and other under 21 year olds? It was the fall of 1963
when I popped down from Laramie (not even 3.2% there) to
tip a few with some WyoU basketball players. They got drunk
but I was driving so didn't but got thrown in the local
lockup anyway for "disorderly conduct" (watching a street
fight).
.
Hi Jim,
.
I wonder if Fort Collins still has it 3.2% beer halls for
CSU and other under 21 year olds? It was the fall of 1963
when I popped down from Laramie (not even 3.2% there) to
tip a few with some WyoU basketball players. They got drunk
but I was driving so didn't but got thrown in the local
lockup anyway for "disorderly conduct" (watching a street
fight).
.
Bud
03-04-10, 05:24 PM
#23
elcraft
Be Careful, there are two different versions of the 110 mm BCD Biopace ring. The steel ones require a thin washer/shim between the chainring and Crank arm spider for each of the chainring bolts. The Alloy versions don't require this shim. Also, their teeth profiles do not match up exactly. I am not sure if one can mix the two types and be successful. I was on this biopace chain ring hunt earlier, but I only discovered this difference after I had purchased some alloy rings for my Steel ringed set. I am not , however, seeking to sell these alloy rings.
03-07-10, 11:35 PM
#24
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okey this set Im looking at must be steel then....how do you tell the size difference?
Last edited by mykesbykes; 03-07-10 at 11:40 PM.
