Need crankset advice
03-23-20, 08:35 PM
#1
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Need crankset advice
I'm looking for some advice on choosing the correct chainrings. I have a Shimano FC 6207 crankset with 52-42 Biopace chainrings, and I want to make a change to non Biopace with a 39T small ring. My crank arms are in great shape so that's why I thought I should just get different rings as opposed to a whole new crankset.
This is for my 87 Ironman Master with Dura ace 7402 rd and Shimano HB 6207 fd.
I'm also considering a whole new crankset like a Shimano Tri-color. You can usually find them with a 52-39.
Which way would you go? All suggestions are welcome.
This is for my 87 Ironman Master with Dura ace 7402 rd and Shimano HB 6207 fd.
I'm also considering a whole new crankset like a Shimano Tri-color. You can usually find them with a 52-39.
Which way would you go? All suggestions are welcome.
03-23-20, 09:55 PM
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You could treat yourself to TA rings in many sizes. 6 speed Shimano is pretty slick with only a 10 tooth jump on the chain rings. I think it would be great to put on a 38-48 or 39-49. https://www.spacycles.co.uk/brands/ta.php Sugino rings are attractive also.
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03-24-20, 07:38 PM
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I may look into your suggestions. They look promising. I forgot that I have an nos Campy Centaur crank with 53-39 Veloce rings that I could use. I'll see if it's going to work out.
03-25-20, 11:40 AM
#4
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I put NOS SR rings on my 6207. 53/39
03-25-20, 01:31 PM
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I believe it was just a color choice, but I’m not 100% on that.
03-25-20, 02:03 PM
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Shimano offered choice in bio-pace or standard. Standard boxed crankset with ring combo 39-45t. I would think a 39t is tight to the 130 bcd.
Searching 130 bcd chainring on eBay will give you lots to pick from.
Searching 130 bcd chainring on eBay will give you lots to pick from.
03-25-20, 03:08 PM
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130 bcd can fit a 38 if necessary.
03-25-20, 03:57 PM
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True, but that is a tight fit. I had to shave a mm or so off my 6200 spider arms to make sure the chain runs clear of them.
03-25-20, 08:12 PM
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For what it's worth, I have ample margin with the 38T inner on my Nervar Star crank (proprietary 128mm BCD). Your spider arms are 1mm longer than mine.
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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
04-03-20, 03:54 PM
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I went with nos chainrings, an SR 52T and a Sugino 38T. They look nice and will work well. The hardest part was dealing with two Ebay sellers that just didn't ship, or even answer my inquiry messages. I was reimbursed from one and am waiting the time requirement on the second. I hope the sellers are doing well and not affected by the virus which might be the cause of them not shipping.
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