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Tandem Cycling A bicycle built for two. Want to find out more about this wonderful world of tandems? Check out this forum to talk with other tandem enthusiasts. Captains and stokers welcome!

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Old 03-08-11, 11:02 PM   #1
robind
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1" tandem disc fork

I have an older Specialized tandem with a 1" threaded fork that was recently retrofitted for a disc brake in the rear. I'd like to get a disc compatible fork as well. Where might I find such a fork?

Edit:
I guess this pretty much answers my question: http://www.bikeforums.net/archive/in.../t-361212.html

Last edited by robind; 03-09-11 at 04:11 AM.
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Old 03-10-11, 10:47 AM   #2
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Before you draw too many conclusions from that thread you may want to read the"" rest of the story""!

http://www.bikeforums.net/showthread.php/666514-Cannondale-fork-now-muerte.-Help!?highlight=

The bottom line is that specific fork, did fail a few years and 9000+ miles later. Granted it was over 20 years old by then with over 25k miles of use by a 300 pound team and some of those later miles were quite abusive.

FWIW I wasn't the first person on this forum to have a well used 1 inch fork fail.

Based on my experience, the thought of adding a disk brake set-up to a 1 inch tandem fork is very disturbing....I urge you extreme caution. Good luck.

Bill J

Last edited by specbill; 03-10-11 at 07:26 PM. Reason: typo
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Old 03-10-11, 06:46 PM   #3
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robind,
specbill has direct relevant experience, but I'm interested in your need/desire for a front disc. Is this an off road tandem or are you located in a locale featuring a lot of climbing? There are numerous threads on brakes and teams climbing/descending with dual calipers, dual v-brakes, front caliper/v-brake, etc. Just about every combination depending on riding style and team weight. The key for the vast majority of teams not having a drum brake is managing rim and/or disc heat which is definitely a riding style issue.
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Old 03-10-11, 06:56 PM   #4
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specbill:
thanks for the link.

rdtompki:
We're located in Santa Cruz, Ca, so yes, many hills and we carry quite a bit of kit sometimes (camping with front and rear panniers). This bike had an Arai previously, but I wasn't really happy with it and the BB7 is a marked improvement. That's where my desire (not so much need...) for a front disc comes from. Maybe I'd be better off upgrading to a newer set of cantilevers (the existing Shimano set looks like original equipment).

A link to some pictures if you're interested:
http://www.flickr.com/photos/robind/5513023791/

Last edited by robind; 03-10-11 at 07:01 PM.
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Old 03-10-11, 08:29 PM   #5
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robind,
I understand Santa Cruz and vicinity hills. If you can't find a front disc option I'm wondering (assuming 700c wheels) if you could go with deeper v wheels to help dissipate the heat during descents. There are some hereabouts who feel the additional wheel surface area, not necessarily mass I would think, will improve cooling. I'm not a mechanical engineer so I'll remain neutral.

On another note. I also have a BB7 and have been using the Avid pads, but I'm tempted to try other brands. We're a 350 lb team and on the first 5 miles of a 10 mile descent (Freemont peak) I really overworked the disc. These first five miles are steep with switchbacks and I suspect I was underusing my front brake although the rim still got very hot, but at the end of five miles I was just about touching the handlebar with the disc brake lever at which time we stopped to let things cool off.
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Old 03-11-11, 05:05 AM   #6
robind
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I'm not really worried about overheating the rims so much, but rather just having better stopping power in general. Are you using cantilever or calipers up front?

I've sent out several emails but so far it seems like my only option is to continue fishing the Internet or to convince a builder to make me a fork.
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Old 03-11-11, 09:14 AM   #7
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Quote:
Originally Posted by robind View Post
I'm not really worried about overheating the rims so much, but rather just having better stopping power in general.
Have you tried premium pads? [Coolstop salmon or swissstop green]
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Old 03-11-11, 02:25 PM   #8
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If you take a look at the pictures you'll see the red Koolstops. However, due to fork clearance I was inclined to install them backwards...It's not like I can't stop the bike, but in the likely event a car cuts us off I just don't think we have the panic-stopping ability we should.
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Old 03-11-11, 09:06 PM   #9
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I've been playing around with the idea of making a special headset to fix this issue. A 1 1/8" steer tube leaves a .7mm gap when passed through a 1" head tube. It seems to me that .65mm of steel is strong enough for this application (the wall thickness of many aluminum headsets is a mere 1mm).
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