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PostPosted: Sat Mar 30, 2013 4:03 pm 
Retro Guru

Joined: Tue Oct 16, 2012 4:16 pm
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Location: NOTTINGHAM
Afternoon people,

Need to replace the chain-rings on a 7400 series crankset - inner one is worn, outer has a broken tooth. Bit of conflicting info out there on the www - velobase says 130BCD which was my original thought, but when double-checking i've seen comments about 135BCD? Anyone able to confirm which is correct please?

Also, I'm assuming I can only go 53-42 so that the set up isn't compromised?

And finally - I want black chain-rings - any knowledge of brands / retailers that will fit the bill?

Many thanks... :)


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PostPosted: Sat Mar 30, 2013 4:05 pm 
Old School Grand Master
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Joined: Fri Oct 14, 2011 8:41 pm
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Location: Cumbria
http://www.velobase.com/ViewComponent.a ... 2&Enum=122

The above you mean ?

130 BCD

Shaun


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PostPosted: Sat Mar 30, 2013 4:10 pm 
Retro Guru

Joined: Tue Oct 16, 2012 4:16 pm
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Location: NOTTINGHAM
that's the stuff Shaun, velobase says 130 on both chainring & crankset and had no reason to question this until I read a couple of forum pieces (not RB) that suggested 135 was in fact correct. caused me to ask the question on here before I spend my monies.


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PostPosted: Sat Mar 30, 2013 4:27 pm 
Old School Grand Master
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Location: Cumbria
There's a black 1st gen 52 tooth 130 BCD chainring on e-bay at the moment............bit tatty though :(

Shaun


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PostPosted: Sat Mar 30, 2013 4:38 pm 
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Location: NOTTINGHAM
Cheers Shaun, good spot - that's added to the radar :)


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PostPosted: Sat Mar 30, 2013 5:58 pm 
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Joined: Mon Feb 01, 2010 8:57 pm
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Definitely 130mm - never seen a 135mm PCD Shimano anything!


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PostPosted: Sat Mar 30, 2013 6:50 pm 
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Joined: Tue Oct 16, 2012 4:16 pm
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Location: NOTTINGHAM
cheers - a few erroneous comments made elsewhere added to the confusion that's for sure.


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PostPosted: Sat Mar 30, 2013 8:44 pm 
Retro Guru

Joined: Fri Apr 28, 2006 8:42 pm
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Location: Brighton
I had 39-50 on my commuting bike with 7402. I don't think you can go much smaller with that BCD though.


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PostPosted: Sat Mar 30, 2013 9:11 pm 
Retro Guru

Joined: Tue Oct 16, 2012 4:16 pm
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Location: NOTTINGHAM
was running the same - 50 / 39 - (and on 7402 - not 7400 as the title suggests :facepalm: )

scouring the www for black for both chainrings - BBB do some but the outer I have is BBB and it's lost a tooth right on the bevel edge so once bitten twice shy on using them again. Hasn't seen that many miles so not sure how it's snapped.


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PostPosted: Sat Mar 30, 2013 9:16 pm 
Road Moderator
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Joined: Thu Jun 18, 2009 1:07 pm
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Location: Sheppey, Kent
Shimano is 130bcd, Campag is 135bcd.

You can just fit a 38t on a 130bcd.


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