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Suntour roller cam brakes

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Suntour roller cam brakes

Old 12-24-16, 03:20 AM
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Suntour roller cam brakes

Looking for info on Suntour roller cam brakes. My old mountain bike uses a U-brake mounted under the chain stay. I would like to replace it with a roller cam brake. From what I can see it looks like Suntour made at least two different versions. On one version it has holes drilled through the arms, (drillium style) and use an external lever type springs. The other type does not have the holes drilled all the way through the arms and uses internal coil springs. Looks like the pulley wheels are also configured different. Does anyone have experience with these brakes and know if one version is preferred over the other?
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Old 12-24-16, 07:43 AM
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My Schwinn (see signature) has an under-chainstay U-brake and a RollerCam of your second type up front.
1. Yes, they take the same mounting boss.
2. I have no experience with the first type of RollerCam you describe.
3. I see no benefit to changing my current setup. The RollerCam is superb in a front wheel application or for a high-mounted rear, but I would think it would be more susceptible to fouling than the U-brake in our bikes' bottom-hung orientation.
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Capo: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger (2), S/N 42624, 42597
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Old 12-24-16, 08:41 AM
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As someone who has run a ubrake underneath the chainstay I can +1 what john said. A roller brake would mess up even sooner, IMO.
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Old 12-24-16, 09:07 AM
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As an owner of a bike with a chainstay mounted U brake, stick with that.
I did go from Shimano to Campagnolo but I got lucky on an auction a number of years ago and I am a Campagnolo guy.
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Old 12-24-16, 09:35 AM
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My mountain bike is set up as a road bike with drop bars and road tires. I use it 90% on pavement and occasionally on hard pack dirt or gravel. Do you think the roller cams would still be a problem for this type of riding? The reason I want to replace my U-brake is because the model I have is garbage. It's a shimano exage, this model has a real bad design and the adjustment mechanism does not work at all. It's almost impossible to get the spring tension the same for both arms. It looks like higher model shimano U-brakes had a better design. I looked at modern U-brakes made for bmx bikes and this might be an option for me also.
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Old 12-24-16, 09:56 AM
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Avoid Suntour roller cam brakes with plastic rollers. I replaced the one on my Japanese Peugeot mtb with a Campy Euclid U-brake.
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Old 12-24-16, 11:06 PM
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I didn't know Campy made a u-brake. I looked it up and they look real nice but they are probably out of my price range. I'm not what sure to get if roller brakes are not recommended. Has anyone tried new u-brakes for bmx bikes?

Last edited by sweet leaf; 12-25-16 at 02:15 AM.
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Old 12-24-16, 11:26 PM
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You're letting imagination get in the way of what's recommended. Nothing wrong with that but under-BB-U brakes were really in Shimanos wheelhouse. Suntour and BMX models often interfere with the drive train. Agree, the Exage mtn models were too 'economical' so look for a nice XT/DX u-brake-set with a sharktooth. Check to see if your mounting posts are compatible, some have less range for spring positions. XT/DX are easier to centre and tension.

Last edited by clubman; 12-24-16 at 11:36 PM.
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Old 12-25-16, 02:27 AM
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I will look into the shimano XT/DX u-brake. Thanks for that info clubman. My top priority really is getting something that is adjustable and cheap so it sounds like old shimano u-brake is the way to go. My current shimano exage initially gave me concern about any u-brake that would work properly. So far no one has anything to say about new U-brakes made for bmx.
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Old 12-25-16, 06:30 AM
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New BMX style brakes work great if you can't find something vintage. Especially the ones with screw type spring adjusters instead of the Paul's style open end wrench adjusters, so much easier to setup and no mushroomed brake mounts.

Also if someone has those garbage plastic roller Suntour brakes I might still have a couple sets of upgrade brass or brass/aluminum rollers. I had a big pile of them at one point.
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Old 12-25-16, 10:44 PM
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As someone who has owned several under the chain stay brakes, I believe The Suntour have the history that come with Charlie Cunningham, where the Shimano have got well..... Which style Suntour you get really is determined by year of the bike if you are into correct restorations, if not, I would suggest the early CB 6000 ones that have linear springs for best results.

Last edited by Aemmer; 12-25-16 at 11:25 PM.
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Old 12-26-16, 02:07 AM
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Thanks for all the info. I'm not in any hurry so I'll keep a look out for an old Shimano U-brake. I'm not too concerned about keeping my bike vintage if there is something that works better but I should be able to find something old for a reasonable price. Sounds like a Shimano U-brake from something higher than the Exage model line is what I need.
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Old 12-26-16, 07:10 AM
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Originally Posted by sweet leaf
... Sounds like a Shimano U-brake from something higher than the Exage model line is what I need.
That's what I have and would recommend, as well.
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Capo: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger (2), S/N 42624, 42597
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Old 12-26-16, 10:14 AM
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Yes Maeda Sun Tour paid WTB, licence fees to use several of their designs.....

too bad no one worked out any Grease Guard External bearing BBs (Im using one of their square taper SunTour GG)




...

Last edited by fietsbob; 12-26-16 at 10:19 AM.
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