Ashtabula Conversion Options
08-28-13 | 03:51 PM
#1
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From: Baltimore MD
Bikes: '72 Motobecane Grand Record, '72 Gitane tandem, '72 Raleigh Super Course, '73 Raleigh Gran Sport, '73 Colnago Super, '76 Fiorelli Coppi, '78 Raleigh SBDU Team Pro, '78 Trek 930, '81 Holdsworth Special 650B, '86 Masi GC, ’94 Bridgestone RB-T
Ashtabula Conversion Options
If I am converting an Ashtabula one-piece crank, if I go with the BMX conversion option: (https://www.ebay.com/itm/290853469598) is chain line adjustable at all? If not I'll go with the Trutative conversion bracket (https://www.ebay.com/itm/281100813599). I plan on converting a '73 Schwinn Super Sport to a 5 speed with a 3-piece crank.
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08-28-13 | 04:02 PM
#2
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From: EagleRiver AK
Does look like the chainline is a bit adjustable using the BMX conversion set, cone-races can be moved a bit on the threaded axle. THe axle itself is 130mm however so should probably only be used with an old-style flat crank, modern curved arm crank would have excessive Q-factor. Also note that the BMX conversion appears to have no dirt/water seals on the bearing, grit would be free to get into the bearings.
08-28-13 | 04:24 PM
#3
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From: Detroit, Michigan
Bikes: 1973 Schwinn Super Sport Sunset Orange, 1974 Le Tour Kool Lemon, 1974 Motobecane Nomade Sprint, 1981 SR Semi-Pro Blue
I ordered a truvativ for my Super Sport... I have a crank-set from a Le Tour that I plan on using but am undecided on bottom-bracket.
08-28-13 | 04:27 PM
#4
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From: Baltimore MD
Bikes: '72 Motobecane Grand Record, '72 Gitane tandem, '72 Raleigh Super Course, '73 Raleigh Gran Sport, '73 Colnago Super, '76 Fiorelli Coppi, '78 Raleigh SBDU Team Pro, '78 Trek 930, '81 Holdsworth Special 650B, '86 Masi GC, ’94 Bridgestone RB-T
Thanks all. I had not noticed the 130mm axle on the BMX BB, so I'll probably go with the Trutative bracket.
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The man who dies with the most toys…is dead. - Rootboy
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08-28-13 | 04:37 PM
#5
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Bikes: Fillet-brazed Schwinns
Agree on the Truvativ (or other similar converter). The BMX conversion is definitely non-adjustable. There is a good article on using the TruvaTiv type converters here: https://hughsbicycle.blogspot.com/201...erican-to.html
08-28-13 | 07:49 PM
#6
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From: Knoxville, TN
Bikes: Schwinn Paramount P15, Fisher Montare, Proteus, Rivendell Quickbeam
I have a new Truvativ still in its packaging that I never got around to using and now the bike I was going to use it on is gone. I'd gladly trade you something for it.
