Difference between Sugino 75 road and track cranks?
11-12-17, 06:35 PM
#1
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Difference between Sugino 75 road and track cranks?
Like the title states, what's the difference?
11-12-17, 07:19 PM
#3
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The spider looks longer than 130 but guess not
11-12-17, 07:23 PM
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The spiders on road cranks would be designed to carry 2 rings, while a track crank would only carry one.
I don't speak with authority on this, but companies that make both road and rack cranks often use the same forging, with the only difference being that they machine off the chainring support shoulder for the inner ring on the track version.
I don't speak with authority on this, but companies that make both road and rack cranks often use the same forging, with the only difference being that they machine off the chainring support shoulder for the inner ring on the track version.
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11-12-17, 07:24 PM
#5
Your cog is slipping.
11-12-17, 08:17 PM
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11-12-17, 08:27 PM
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it's easy enough to check bolt circle diameter. measure on center between 2 adjacent bolt holes, then multiply by 1.7. (5 arms)
Ie. a 5 arm 130 BCD crank will measure 76.5mm bolt to bolt.
Ie. a 5 arm 130 BCD crank will measure 76.5mm bolt to bolt.
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Last edited by FBinNY; 11-12-17 at 08:32 PM.
11-12-17, 08:32 PM
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I'm guessing he doesn't have them yet. Probably saw for a good price on eBay and is wondering if the road version is really a good bargain.
11-12-17, 08:36 PM
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I've done that job, and it goes very fast if you start with a very coarse file. Complete the job a half mill file for a smooth finish.
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11-12-17, 09:21 PM
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11-12-17, 09:22 PM
#11
Your cog is slipping.
11-12-17, 09:22 PM
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It depends on the frame and chain line. On my track bike, the inner support wouldn't clear the chainstay.
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11-12-17, 09:37 PM
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Got it, thanks guys. In my mind's eye the chainring was hitting the chainstay before that shoulder would; guess I'll have to adjust my mental imaging. 
11-12-17, 09:42 PM
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Don't sweat it until you see it together. As I said, it depends on the bike, so you may be OK, or may need to take out the file.
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11-13-17, 11:53 AM
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11-14-17, 09:57 AM
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AFAIK, The 75 series of Sugino cranksets are strictly a track version with a 144 bcd. They are currently available as either square taper or external BB with splined interface.
Edit - I did some research, and it appears that road versions of the Sugino 75 series were made in the 1980s, but are no longer being made.
Edit - I did some research, and it appears that road versions of the Sugino 75 series were made in the 1980s, but are no longer being made.
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Last edited by TejanoTrackie; 11-14-17 at 10:04 AM.
11-16-17, 11:41 AM
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There actually is an entire sugino 75 road groupset. I learned of this when I ran into a partial group at a veloswap and later read up on the group at velobase. Apparently they had contracted out manufacturing of the non-crank bits to Suntour.
VeloBase.com - View Group
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11-16-17, 11:46 AM
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11-16-17, 12:10 PM
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75 road cranks can run a 1/8th chain and chainring without issue when set up as a single. Even with the chainring on the outside of the spider.
If anything you're just limited by your ability to find chainring sizes in 130 bcd and crankset lengths running them on the track.
If anything you're just limited by your ability to find chainring sizes in 130 bcd and crankset lengths running them on the track.
11-16-17, 12:38 PM
#20
Your cog is slipping.
Specialites TA makes really nice 1/8" 130bcd chainrings in sizes ranging from 44-52t and longer crank arms aren't an issue on the track considering one leans away from the banked corners.
11-16-17, 01:04 PM
#21
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What ever 
young contrarian, my old Campag road are 144 BCD, track crank spiders are machined to only have an outer chainring..
young contrarian, my old Campag road are 144 BCD, track crank spiders are machined to only have an outer chainring..
11-16-17, 01:54 PM
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That’s not the problem. When riding at slower speeds, the up track right side crank can hit on the banking in the turns on steeper tracks. I’ve seen this happen to a track rider that liked to use 175mm crank arms and really tall gearing.
11-16-17, 02:18 PM
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75 road cranks can run a 1/8th chain and chainring without issue when set up as a single. Even with the chainring on the outside of the spider.
If anything you're just limited by your ability to find chainring sizes in 130 bcd and crankset lengths running them on the track.
If anything you're just limited by your ability to find chainring sizes in 130 bcd and crankset lengths running them on the track.
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