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Spindle Length for Sugino GT cranks?

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Spindle Length for Sugino GT cranks?

Old 09-23-09, 10:56 AM
  #1  
sjpitts 
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Spindle Length for Sugino GT cranks?

I still need to get my wife some lower gears. The bike has dura ace 7400 cranks with 53/42 rings. I would like to try and get her something like a 48/36. I don't think I can get chainrings for the 7400 cranks that small, so I am looking at other options. I would prefer to leave the BB alone-- and it is a dura ace 7400 with 112mm spindle.

I have a pair of Sugino GT double cranks from an 83-84 centurion lemans. These take 110mm BCD chainrings, so I am pretty sure I can get the right chainrings for them. But I don't know the correct spindle length for those cranks. I have checked velobase and the sheldon brown database, but no info is on the GT cranks there.

Anybody know? Is the GT close in set up to aother sugino crank that might be in the database?

I would be interested in buying or trading for a suitable crankset if this does not work out. 170/172.5 length is desired. Something with a traditional style that will fit on the dura ace 7400 BB with 112mm spindle is really what I would want.

Jared
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Old 09-23-09, 02:46 PM
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The spindle length on my old GT's is 120 mm english threads
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Old 09-23-09, 07:04 PM
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Charles Wahl
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Originally Posted by dit View Post
The spindle length on my old GT's is 120 mm english threads
The GT was made in both double and triple versions. Was yours a triple? The length of the spindle you give sounds like it.

To sjpits: I'm almost certain that the Sugino GT took a JIS spindle (good for you, because there are a lot of them available inexpensively). What length spindle was in the donor bike? If you don't know, then it's trial-and-error time. My guess is that the Dura-Ace spindle will be too short, and it's not as chunky at the end as JIS, either.
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Old 09-23-09, 07:28 PM
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Originally Posted by Charles Wahl View Post
To sjpits: I'm almost certain that the Sugino GT took a JIS spindle (good for you, because there are a lot of them available inexpensively). What length spindle was in the donor bike? If you don't know, then it's trial-and-error time. My guess is that the Dura-Ace spindle will be too short, and it's not as chunky at the end as JIS, either.
I don't have the bottom bracket, and I didn't measure it. As I said, it was early 80's centurion lemans 12. I think an 83.

And velobase lists the 7400 dura ace crankset as JIS. Is that incorrect?

Jared
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Old 09-24-09, 07:50 AM
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Originally Posted by sjpitts View Post
And velobase lists the 7400 dura ace crankset as JIS. Is that incorrect?
All I can tell you is that Sutherland's doesn't agree. They list 7300 and earlier as JIS, and 7400 onward as "Campy."
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Old 09-24-09, 11:56 AM
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Originally Posted by Charles Wahl View Post
All I can tell you is that Sutherland's doesn't agree. They list 7300 and earlier as JIS, and 7400 onward as "Campy."
Well now I don't know what to think. But another data point-- Sheldon seems to imply that Japanese used JIS

https://www.sheldonbrown.com/bbsize.html#square
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Old 09-24-09, 04:08 PM
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The GT was made in both double and triple versions. Was yours a triple? The length of the spindle you give sounds like it.

It was/is a double. I don't remember how I came up with the bb. I am sure it came from Nashbar in the middle 70"s.
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Old 09-24-09, 08:40 PM
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Originally Posted by sjpitts View Post
Well now I don't know what to think. But another data point-- Sheldon seems to imply that Japanese used JIS
https://www.sheldonbrown.com/bbsize.html#square
He said "most Japanese models" -- and Sutherland's gives the exceptions: 7400 Dura-Ace and later, until {mumble}Link; Suntour Sprint and Superbe, and Sugino Mighty Competition. All the manufacturers felt compelled to copy Campagnolo on their dee-luxe Professional-grade line taper. It was a token of high seriousness.

Go ahead and try your 112 mm Dura-Ace spindle. I've got $5 that says it's going to be several mm too short, between the smaller-than-JIS taper, and the general stubbiness of that spindle length for a road crank. Now if you want to turn the missus' bike into a fixed-gear, it might work out just fine!

Last edited by Charles Wahl; 09-24-09 at 08:45 PM.
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Old 12-26-12, 07:36 PM
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the Vast majority of sugino cranks of that era used the ISO standard bb axel, this will greatly impact your clearance if you attempt to use this on the now standard JIS bb axel. it should move your crank roughly 4mm closer than what you need almost undoubtedly causing striking against the frame from either the crank arms or the chain rings. youll probably have to do one of two things, either find new chainrings that fit or change the bb to ISO, it should probably measure out to something like 107 mm. of course you could also try using some spacers between the bottom bracket shell on the drive side and try the gt cranks, I had to use a similar method to get the proper chain line when using some sugino super maxy cranks on my fixed conversion, I simply couldnt use the old bb and had a 113mm JIS bb laying around so i put it on, of course it ended up being to far out...luckily i had some spacers and remembered that the spidering on the cranks is something like 4mm, so put a 2mm spacer on, put the chainring on the inside and bam! ended with 107mm, lot of freaking work but worked out splendidly.
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Old 12-26-12, 07:41 PM
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Dude, this is a three-year-old thread.
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Old 09-14-16, 05:47 PM
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Originally Posted by ThermionicScott View Post
Dude, this is a three-year-old thread.
Just as well - 4 years further down the line & he's given the detail I'm looking for. Currently trying to find out if I can make a GT Triple work, and that JIS/ ISO info is pretty pertinent. Thanks internets!
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