Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

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!

User Tag List

Reply
 
Thread Tools Search this Thread
Old 05-08-14, 08:03 AM   #1
2frmMI
Member
Thread Starter
 
Join Date: Aug 2009
Location: Mid Michigan
Bikes: Erickson Signature, Paketa D2R
Posts: 332
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Richey Break-Away Tandem now official...

Hope this isn't redundant - did a search here on the forum and did not find this: The Ritchey Break-Away Switchback Tandem is now listed on the Richey web site and they appear to be taking orders (at least you can add it to your cart). What I find kind of interesting is the dual 650b/700c geometry. Seems like an exciting addition to tandem choices!
Break-Away Double Switchback Tandem - Break-Away Tandem - Frames
Attached Images
File Type: jpg break-away-tandem.jpg (22.6 KB, 28 views)

Last edited by 2frmMI; 05-12-14 at 10:45 AM. Reason: spelling oops
2frmMI is offline   Reply With Quote
Old 05-08-14, 11:16 AM   #2
waynesulak
Senior Member
 
waynesulak's Avatar
 
Join Date: Jan 2008
Location: Ft Worth, TX
Bikes: 650B tandem converted from Santana Arriva, Santana Noventa, Boulder Bicycle 700C, Gunnar Sport, Trek TX700,
Posts: 1,913
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Nice to see it is finally available. We seen it on the web for years now.

This must be designed to be a mountain tandem otherwise sizing is a mystery for me. I am 5'8" and ride a 54cm to 56cm top tube bike. The "Small" size has an effective captain top tube length of 575! Maybe with flat bars but never with road bars. Head tube angle 71.5 degrees and 47mm fork rake. That is more trail than I want to calculate. No frame weight given that I can see. My guess is 11-12 lbs for frame only plus 2.5 lbs for fork. Could be more.

Some with mountain tandem knowledge can chime in on off road desirability but for a 650B tandem road team like us it is a nonstarter.






Attached Images
File Type: jpg web-geometry-double-switchback-tandem.jpg (91.7 KB, 15 views)
waynesulak is offline   Reply With Quote
Old 05-08-14, 02:02 PM   #3
twocicle
Clipless in Coeur d'Alene
 
twocicle's Avatar
 
Join Date: Mar 2012
Location: Coeur d'Alene, Idaho
Bikes: Calfee Dragonfly S&S Tandem, Specialized Tarmac SL4 S-Works, other misc Road & MTB singles
Posts: 1,622
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 9 Post(s)
$3,495.95 MSRP for a travel frame ain't bad news.

Funny to see a resurrection of the reverse lateral and pinch-bolt eccentric(?). Seems like sort of a throw back design.

No info about rear spacing. Standard QR dropouts. Only one stoker bottle mount.

The Small would fit us ok.

Set this up as a cross-tandem with 29er wheels (f/r discs) and forget about ever achieving weight weenie status... doubt you'd care when taking a breather atop an alp trail listening to the cow bells ring.

Last edited by twocicle; 05-08-14 at 03:25 PM.
twocicle is offline   Reply With Quote
Old 05-08-14, 02:28 PM   #4
ct-vt-trekker
Senior Member
 
Join Date: Jun 2007
Location: CT, VT
Bikes:
Posts: 327
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
You misspelled Ritchey so the search threads didn't come up.

I was following it here New Ritchey Breakaway tandem soon to be released

Interesting that it's more expensive than earlier estimates and no mention of the cases? I had heard it's release was delayed the last 2 years because of design issues related to the cases.
ct-vt-trekker is offline   Reply With Quote
Old 05-08-14, 02:43 PM   #5
Monoborracho
Senior Member
 
Monoborracho's Avatar
 
Join Date: Dec 2005
Location: Deep In The Heart
Bikes: Seven Ti Tandem, Blue T12 tri bike, 92 Paramount, 93 Schwinn Mesa MTB, Soma Saga
Posts: 2,607
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
I can't really see the price point for the bike.

A Rodriquez steel custom frame is $2200. S&Souplers add $2000. Their steel fork is $125 with the frame. That's $4325+/- for a custom build.

Just my take.
Monoborracho is offline   Reply With Quote
Old 05-08-14, 04:03 PM   #6
waynesulak
Senior Member
 
waynesulak's Avatar
 
Join Date: Jan 2008
Location: Ft Worth, TX
Bikes: 650B tandem converted from Santana Arriva, Santana Noventa, Boulder Bicycle 700C, Gunnar Sport, Trek TX700,
Posts: 1,913
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Quote:
Originally Posted by twocicle View Post
$3,495.95 MSRP for a travel frame ain't bad news.

Funny to see a resurrection of the reverse lateral and pinch-bolt eccentric(?). Seems like sort of a throw back design.

No info about rear spacing. Standard QR dropouts. Only one stoker bottle mount.

The Small would fit us ok.

Set this up as a cross-tandem with 29er wheels (f/r discs) and forget about ever achieving weight weenie status... doubt you'd care when taking a breather atop an alp trail listening to the cow bells ring.
With pinch bolts and reverse lateral it looks like he took is old frame he designed when he was young and just put it into production.

We can have fun with that frame but we can have fun on an old Jack Taylor too. With 700C wheels your 73 HT angle 43 rake fork bike has about 58.6 trail (depending on tires) while that bike assuming same tires has 63.8 trail. It is not just the trail but the HT angle that would worry me. If you are into "wheel flop" calculation then yours is about 16.4 and the Ritchey is huge 19.2 It would be extremely sensitive to weight shifts. For comparison a Como Speedster steel fork bike has only 51.3 trail and 14.3 flop. Santana standard geometry is 46 trail and 12.9 flop. The trend is Santana is a little less trail than the Commotion and then way out there is the Ritchey.

Last edited by waynesulak; 05-08-14 at 04:06 PM.
waynesulak is offline   Reply With Quote
Old 05-08-14, 04:10 PM   #7
twocicle
Clipless in Coeur d'Alene
 
twocicle's Avatar
 
Join Date: Mar 2012
Location: Coeur d'Alene, Idaho
Bikes: Calfee Dragonfly S&S Tandem, Specialized Tarmac SL4 S-Works, other misc Road & MTB singles
Posts: 1,622
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 9 Post(s)
Quote:
Originally Posted by waynesulak View Post
With pinch bolts and reverse lateral it looks like he took is old frame he designed when he was young and just put it into production.

We can have fun with that frame but we can have fun on an old Jack Taylor too. With 700C wheels your 73 HT angle 43 rake fork bike has about 58.6 trail (depending on tires) while that bike assuming same tires has 63.8 trail. It is not just the trail but the HT angle that would worry me. If you are into "wheel flop" calculation then yours is about 16.4 and the Ritchey is huge 19.2 It would be extremely sensitive to weight shifts. For comparison a Como Speedster steel fork bike has only 51.3 trail and 14.3 flop. Santana standard geometry is 46 trail and 12.9 flop. The trend is Santana is a little less trail than the Commotion and then way out there is the Ritchey.
Geez, 46 trail for the Santana. No wonder I'm whining about the current 58 on our ride.

Interesting playing with this calculator. I see why Craig suggested a 50mm offset.. closer to CoMo specs:
Bicycle Trail Calculator | yojimg.net

Last edited by twocicle; 05-08-14 at 04:20 PM.
twocicle is offline   Reply With Quote
Old 05-09-14, 07:00 AM   #8
waynesulak
Senior Member
 
waynesulak's Avatar
 
Join Date: Jan 2008
Location: Ft Worth, TX
Bikes: 650B tandem converted from Santana Arriva, Santana Noventa, Boulder Bicycle 700C, Gunnar Sport, Trek TX700,
Posts: 1,913
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
The trail calculator is nice. For me wheel flop is more critical than trail but if you hold HT angle constant then trail is a substitute for flop. Wheel flop measures the effect on steering of the front weight applied at the HT angle. Slacker angles make weight tend to turn the wheel. A 90 degree HT angle would mean weight on the front end would have no steering effect. Think grocery cart wheels. 71.5 degree HT angle results in front of the bike dropping a lot as the wheel turns and therefore the weight on the front of the bike tends to turn the wheel more and the bike falls more into turns. A little of this is good but too much is bad. This is important for tandem because there is a lot of weight on the front wheel. People differ in their preference for this power steering effect.

The distinction is only important where the HT angle changes. I have never ridden a tandem with a very steep HT angle but they are said to have the best of both high and low trail. Unfortunately due to toe overlap concerns most production bikes in smaller sizes decrease the HT angle regardless of its effects on handling.

As I understand it:

Wheel flop = Sine(headtube angle) * Cosine(trail)
waynesulak is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -6. The time now is 12:43 PM.