Triple Conversion?
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Triple Conversion?
I have an '82 Bruce Gordon framed 10-speed with a Campy Super Record crank and Suntour Perfect freewheel, and want lower gears. I've read about the Peter White conversion kit for adding a third chainring to this crank. Does anyone here have experience with it? I have a Suntour Cyclone GT rear derailleur to use, and the Campy Nuovo Record front derailleur should work too I think. Are there any alternatives to the PW system? Am I committing a sin by considering this?
#2
Bicycle Repair Man !!!
The Cyclone Gt will handle a wide range block so if you do not mind wider gaps you could install a freewheel with lower gearing and see if that works and leave the SR crank intact.
Have converted doubles to triples using longer stack bolts and spacers which is an old fashioned solution to get lower gearing on a road double with no provision for a granny... you will need a longer crank spindle for this in most cases.
Have converted doubles to triples using longer stack bolts and spacers which is an old fashioned solution to get lower gearing on a road double with no provision for a granny... you will need a longer crank spindle for this in most cases.
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Well, you could always do the old 52-47-42 triple. Sort of a corncob front.
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I've used the TA triplizer inner ring for Campagnolo a few times. Its a cool setup, though I've used Rally rears. My daily rider:
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I have an '82 Bruce Gordon framed 10-speed with a Campy Super Record crank and Suntour Perfect freewheel, and want lower gears. I've read about the Peter White conversion kit for adding a third chainring to this crank. Does anyone here have experience with it? I have a Suntour Cyclone GT rear derailleur to use, and the Campy Nuovo Record front derailleur should work too I think. Are there any alternatives to the PW system? Am I committing a sin by considering this?
Note to all: those TA tripleizers won't work as-is on a Gran Sport 144 arm - the spider arms are too thick (radially) where the tripleizer needs to clear them, fwiw.
#8
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The Peter White triple-izer is a bolt on which works well. Key, as Sixty-Fiver pointed out, is the BB spindle length.
I sent a Campy drive crank arm to Elliot Bay Cycles in Seattle, to have Bob Freeman drill a permanent triple-ized bolt holes. I turned a Super Record into a Campy triple that could take smaller inner rings than the original Campy triple (that, at 100bcd, was limited to 36t). It was slightly less expensive than the Peter White solution, but only just.
This is my crank, post drilling:
I did swap out the bottom bracket to a proper triple BB, tho.
It's worth it to get those lower gears. IMHO, of course.
I sent a Campy drive crank arm to Elliot Bay Cycles in Seattle, to have Bob Freeman drill a permanent triple-ized bolt holes. I turned a Super Record into a Campy triple that could take smaller inner rings than the original Campy triple (that, at 100bcd, was limited to 36t). It was slightly less expensive than the Peter White solution, but only just.
This is my crank, post drilling:
I did swap out the bottom bracket to a proper triple BB, tho.
It's worth it to get those lower gears. IMHO, of course.
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1963 Hetchins Mountain King
1971 Gitane Tour de France (original owner)
* 1971 Gitane Super Corsa (crashed)
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1980 Ritchey Road Touring (The Grail Bike)
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1959 Hilton Wrigley Connoisseur (my favorite!)
1963 Hetchins Mountain King
1971 Gitane Tour de France (original owner)
* 1971 Gitane Super Corsa (crashed)
* rebuilt as upright cruiser
1971 Gitane Super Corsa #2 (sweet replacement)
1980 Ritchey Road Touring (The Grail Bike)
1982 Tom Ritchey Everest
(replacing stolen 1981 TR Everest custom)
1982 Tom Ritchey McKinley (touring pickup truck)
1985 ALAN Record (Glued & Screwed. A gift.)
Last edited by LeicaLad; 09-17-11 at 08:08 AM. Reason: added photo
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The Peter White triple-izer is a bolt on which works well. Key, as Sixty-Fiver pointed out, is the BB spindle length.
I sent a Campy drive crank arm to Elliot Bay Cycles in Seattle, to have Bob Freeman drill a permanent triple-ized bolt holes. I turned a Super Record into a Campy triple that could take smaller inner rings than the original Campy triple (that, at 100bcd, was limited to 36t). It was slightly less expensive than the Peter White solution, but only just.
I did swap out the bottom bracket to a proper triple BB, tho.
It's worth it to get those lower gears. IMHO, of course.
I sent a Campy drive crank arm to Elliot Bay Cycles in Seattle, to have Bob Freeman drill a permanent triple-ized bolt holes. I turned a Super Record into a Campy triple that could take smaller inner rings than the original Campy triple (that, at 100bcd, was limited to 36t). It was slightly less expensive than the Peter White solution, but only just.
I did swap out the bottom bracket to a proper triple BB, tho.
It's worth it to get those lower gears. IMHO, of course.
FWIW, that 100 mm BCD will take a chainring as small as 31 teeth (but Campagnolo only made 36-tooth ones). Jim Merz used to make 31-tooth rings for those, but I don't think he has done any in ages.
Are the 'Peter White parts" just a TA tripleizer ring? A Willow one? I'll go look at his website.
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You're welcome. You could use a wide-range 14-17-21-26-34 freewheel, and the 52-47 would give you nice half-steps and smooth out the big jumps. You'd have more half-steps between the 47 and the 42. Of course, you'd only have a 42-34 low. What's that, something like 35 inches? I don't have a gear chart in front of me. That's too high for an old guy like me who lives in the midst of long steep hills with unpaved roads. But you're young and strong, right?
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You're welcome. You could use a wide-range 14-17-21-26-34 freewheel, and the 52-47 would give you nice half-steps and smooth out the big jumps. You'd have more half-steps between the 47 and the 42. Of course, you'd only have a 42-34 low. What's that, something like 35 inches? I don't have a gear chart in front of me. That's too high for an old guy like me who lives in the midst of long steep hills with unpaved roads. But you're young and strong, right?
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Thanks for all the input everyone! Love to see someone who had the spider drilled out for a new inner ring!!! I believe I'll go with the PW system because it's reversible.
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Been there ... done that for about 20 years. Actually, I did a 49-46-43 / 13-16-19-23-26 14-speed (large-large cross deliberately redundant w/ 43/23), as well as a 50-47-44 / 14-16-19-23-26 13-speed (both crosschains redundant). When I worked at Bikecology, we converted one chap's Nishiki to a 54-50-47 / 14-18-22-28-34, using only the 50T ring, five long stackbolts and a long spindle. I kind of like "third-step" gearing.
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Capo: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger (2), S/N 42624, 42597
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"Far and away the best prize that life offers is the chance to work hard at work worth doing." --Theodore Roosevelt
Capo: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger (2), S/N 42624, 42597
Carlton: 1962 Franco Suisse, S/N K7911
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1982 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069
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