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Suntour Pedal Caps

Old 02-10-19, 05:51 PM
Sprocket Turner
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Suntour Pedal Caps

So I lost one of my caps to my Suntour GPX pedals.

It has been suggested that I buy some MKS pedal caps and grind off the lettering. Has anyone had experience with doing this and would care to share their experiences? Are there any other suggestions?

They are for the following bike. A "85 Trek 660 Custom". What suggests that it is custom is in 85 the two top tier bikes they had were the 760 and the 660. The 760 was made from Reynolds 531c and had a different geometry than the 660 which was made from Reynolds 531. This frame matches the geometry of the 660 but was made using Reynolds 531c. The other characteristic of this bike that suggests that it might be custom is that it has factory installed internal top tube cable routing which Trek never did on their steel bikes, but did begin to with their aluminum bikes that came out in 1986. (I realize I don't have pictures of the cable routing available and will post them as soon as possible)

I'm open to solutions and suggestions. Thank you for reading.
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Old 02-10-19, 06:16 PM
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The MKS cap idea is a good one, I wouldn't grind it, just put it on as a placeholder till/if you find a correct one.
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Old 02-10-19, 07:37 PM
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...I've used MKS caps as replacements on a number of brands of pedal. I'm not OCD enough to care what they might say on the side, so that part is lost on me. MKS makes a number of pretty nice replacement pedals as well. ONe is a knock off of an old Suntour Superbe road pedal.
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Old 02-10-19, 10:17 PM
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Is a MKS cap going to fit on that Suntour? I thought the GPX were smaller.
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Old 02-11-19, 08:18 AM
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That looks like a fun bike!

If you want to find out what it is, look up the serial number on the Vintage Trek website.

My immediate thought is that you have a user modified bike- GPX didn’t come out until 1988/89

@JohnDThompson do you remember work like internal TT cable routing being done?

Additionally, Trek’s old nomenclature system (until 1986) was based around the tube set and the geometry (and sometimes component group). The first number denotes the tubing- The only time I’ve read otherwise was the Columbus framed Trek TX770.
Any 700 series bike is going to have 531 main tubes and 531 fork and stays. Any 600 series bike is going to have a 531 main frame and CrMo or MnMo-ish fork and stays. It looks like every 1985 600 series Trek is made from 531CS- a set made with 531 main tubes and Reynolds CrMo fork and stays.

If Trek made a bike that was 531/531, they’d want it to be referred to as a 700 series bike, not only for the prestige of being an “all 531” 700 series bike, but also because a 700 series bike will cost more. 700 series bikes were entirely made in Waterloo and all 600 series bikes had the forks and rear triangles put together by Tange in Japan, then final assembly and paint was done in Waterloo-

Whether it’s a custom or customized bike- it’s a bike someone really appreciated- enough to put an upper level group set on.

EDIT- It looks like the 660 and 670 had the "Aero Crown" on the fork- unlike any of the other bikes in the lineup with cast crowns.
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Last edited by The Golden Boy; 02-11-19 at 04:54 PM.
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Old 02-11-19, 01:25 PM
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The GPX was added later.
Peter, you could just go with 2 MKS caps....?
I still have a set of the pedals. I like the wider 🦶 print.

Last edited by RobbieTunes; 02-11-19 at 01:31 PM.
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