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Triple Chainring on Vintage Super Record / Ofmega Bike

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Triple Chainring on Vintage Super Record / Ofmega Bike

Old 10-21-19, 11:37 AM
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djs42
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Triple Chainring on Vintage Super Record / Ofmega Bike

I have an 80's vintage Guerciotti with Super Record derailleurs and bottom bracket and Ofmega 52/52 170 chain ring and crank.
I would like to add a small chain ring to give me granny gears when required ( .. I know there are some grannies out there who could kick my butt, so apologies for the reference).
I've heard of "triplizer" .. would this work?
Does anyone know if an older triple crankset would also work, and where I might find one?
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Old 10-21-19, 11:58 AM
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You could probably write a book on this topic. I don't know your bike, bottom bracket configuration, etc but In my opinion, the simplest approach is probably to adapt a mountain bike crankset and longer bottom bracket spindle. The Sugino AT crankset is an excellent part and can be had on eboy for 125 or so.

next option is to go to a middle "triple-izer" ring which allows you to mount a small inner ring. Might work on your current BB, but again hard to tell without pics / measurements.

last / most expensive choice is to have your crank drilled to accept an inner ring and then come up with the bolts and spacers.

Lastly you might need to find a derailleur that can take up more chain. Not always required if you only use the inner ring with the 2 largest cogs.

Do some research and decide what you want to spend. Search the forum, this topic has been discussed many times before.

Mark Petry
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Old 10-21-19, 12:03 PM
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A super record RD can handle up to 28 teeth. Easiest way to get better climbing gears is to go with a "compact" crank. With a 110 bcd crank, you can run a small chain ring as small as 34. If 34/28 works for you, this is easy. There are lots and lots of old MTB triples out there with 110/74 bcd chainrings. Find one you like and run it as a double.

If that is not low enough for you, find a 46/30 crank. IRD has them; velo orange does as well. Other companies sell them as well.

I'm in the process of rebuilding my 1978 Trek TX 900. I plan on running a super record RD with a 13-28 FW. I'll likely go with a 46/30 IRD double crank.
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Old 10-21-19, 12:10 PM
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Whether a triplizer will work or not depends on your bolt circle. 52-42 cranks often had a 144mm 5-bolt circle, and triplizers for these do exist, although there aren't tons of them floating around. You'd also potentially need to change your BB spindle to push the drive-side crank a bit farther outboard.
Alternately, you could just buy a triple.

Originally Posted by bikemig
There are lots and lots of old MTB triples out there with 110/74 bcd chainrings. Find one you like and run it as a double.
If you're going to run a triple as a double using the small-middle positions on a friction setup, I don't understand why you wouldn't just run it as a triple. Using it as a small-middle double doesn't get you any benefit in q-factor, and the bigger shift will be less smooth and more disruptive, not to mention that you'll likely end up with less total gear range. Seems like the worst of all worlds.

Well, except for the design of that Super Record rear derailleur, I guess. It's not designed to play well with wide front gearing, either in terms of geometry or chain wrap. Personally, I'd ditch it and use something like a SunTour GT derailleur.
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Old 10-21-19, 12:16 PM
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Originally Posted by HTupolev
Whether a triplizer will work or not depends on your bolt circle. 52-42 cranks often had a 144mm 5-bolt circle, and triplizers for these do exist, although there aren't tons of them floating around. You'd also potentially need to change your BB spindle to push the drive-side crank a bit farther outboard.
Alternately, you could just buy a triple.


If you're going to run a triple as a double using the small-middle positions on a friction setup, I don't understand why you wouldn't just run it as a triple. Using it as a small-middle double doesn't get you any benefit in q-factor, and the bigger shift will be less smooth and more disruptive, not to mention that you'll likely end up with less total gear range. Seems like the worst of all worlds.

Well, except for the design of that Super Record rear derailleur, I guess. It's not designed to play well with wide front gearing, either in terms of geometry or chain wrap. Personally, I'd ditch it and use something like a SunTour GT derailleur.
Triplizers are available for a 144 bcd crank. 144 BCD Triplizer, 42 Teeth

When it cames to running a 110/74 bcd triple as a double, what you disagree with is not what I suggested. I didn't suggest running it as a 110/74 bcd double but as a 110 bcd double.

That's actually a pretty good, inexpensive solution for getting a lower gear. The OP might be happy with a 34 running on a 28 in the rear for example. The OP may not care for example that this likely gives up some top end.

Last edited by bikemig; 10-21-19 at 12:34 PM.
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Old 10-21-19, 12:31 PM
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Originally Posted by bikemig
Triplizers are available for a 144 bcd crank.

When it cames to running a 110/74 bcd triple as a double, what you disagree with is not what I suggested. I didn't suggest running it as a 110/74 bcd double but as a 110 bcd double.

That's actually a pretty good, inexpensive solution for getting a lower gear. The OP might be happy with a 34 running on a 28 in the rear for example.
I believe I'm running 12-26 6 speed on the rear currently. I have a very slightly used 12-19 Regina America that only saw triathlon use.
A 34 paired with my current 26 may be all I need, or possibly simpler to do something like kill the 12 and add a 34 to the cog on the rear.
Mostly flat and windy here and rarely if ever do I get to use 52 / 12 pairing anyways.
Any recommendations to where I can find a configurable ISO thread 6 speed hub?
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Old 10-21-19, 12:40 PM
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Originally Posted by djs42
I believe I'm running 12-26 6 speed on the rear currently. I have a very slightly used 12-19 Regina America that only saw triathlon use.
A 34 paired with my current 26 may be all I need, or possibly simpler to do something like kill the 12 and add a 34 to the cog on the rear.
Mostly flat and windy here and rarely if ever do I get to use 52 / 12 pairing anyways.
Any recommendations to where I can find a configurable ISO thread 6 speed hub?
The super record can handle 28 teeth so you can run a 48/34 with a 13-28 freewheel. It will not work with a 34 tooth freewheel. If you want say a 32 in the rear, this will do the trick

https://www.somafab.com/archives/pro...ur-cage-plates

You can pick up a new holdsworth branded crank with 48/34 rings for around $130 shipped:

https://www.planetx.co.uk/i/q/CSHOCN...retro-crankset

Do you need a new freewheel rear hub or a new freewheel?
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Old 10-21-19, 12:55 PM
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Originally Posted by bikemig
When it cames to running a 110/74 bcd triple as a double, what you disagree with is not what I suggested. I didn't suggest running it as a 110/74 bcd double but as a 110 bcd double.
Ah, gotcha. I was thinking you were implying using the 74 given that you mentioned the 110/74 rather than just that it could mount multiple rings on a 110; one of my bikes uses a Sugino Mighty Tour triple with 110BCD for all 3 rings.
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Old 10-21-19, 01:23 PM
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Originally Posted by djs42
I have an 80's vintage Guerciotti with Super Record derailleurs and bottom bracket and Ofmega 52/52 170 chain ring and crank.
I would find a 52/52 crank limiting as well.
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Old 10-21-19, 02:04 PM
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Oops .. 52/42
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Old 10-21-19, 02:11 PM
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Originally Posted by djs42
I have an 80's vintage Guerciotti with Super Record derailleurs and bottom bracket and Ofmega 52/52 170 chain ring and crank.
I would like to add a small chain ring to give me granny gears when required ( .. I know there are some grannies out there who could kick my butt, so apologies for the reference).
I've heard of "triplizer" .. would this work?
Does anyone know if an older triple crankset would also work, and where I might find one?
Your Ofmega crank likely has a 144mm bolt circle diameter and triplizer rings are available from e.g. Red Clover Components:

About Triplizers - Red Clover Components

Avocet cranks were made by Ofmega were available with drilling to mount a standard 74mm BCD inner ring:



They turn up on e.g. eBay fairly often, and usually aren't too pricey.

Regardless of which option you use to mount a third ring, you will need a longer bottom bracket axle to allow the inner ring to clear the frame, and a longer cage on the rear derailleur to wrap the additional chain needed to use the triple ring setup. If you want to keep your Super Record rear derailleur, Soma Fabrications offers a long cage that can directly replace the current cage:


https://www.somafabshop.com/shop/pro...0?category=961

Or, you can replace the entire derailleur with a long-cage unit, and probably enjoy better shifting performance than the modified Super Record.

Last edited by JohnDThompson; 10-21-19 at 02:14 PM.
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Old 10-21-19, 02:38 PM
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Originally Posted by ThermionicScott
I would find a 52/52 crank limiting as well.
But I bet it would shift sweet...
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Old 10-21-19, 04:04 PM
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I've used both the Soma cage and the Red Clover tripleizer on a NR drivetrain. 13-24 six block and 52/42/28 up front. Worked as well as any NR drivetrain.....

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Old 10-21-19, 04:32 PM
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John beat me to the Avocet/Ofmega touring triple:


1986 Trek 400 Elance by Dave The Golden Boy, on Flickr
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