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


Go Back   > >

Folding Bikes Discuss the unique features and issues of folding bikes. Also a great place to learn what folding bike will work best for your needs.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 09-16-08, 06:14 AM   #1
timo888
...poet...
Thread Starter
 
timo888's Avatar
 
Join Date: Jul 2008
Location: Mid-Atlantic USA
Bikes: bikes
Posts: 624
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
XOOTR Swift front derailer prototype pics

In response to a request for info, Xootr sent me these pics of the front-derailer prototype. They're in-house but the website hasn't been set up yet for selling them nor have the installation instructions been finalized.

Regards
T

P.S. Posted here with Xootr's permission.
Attached Images
File Type: jpg img_4976.jpg (60.2 KB, 99 views)
File Type: jpg img_4977.jpg (52.1 KB, 73 views)
File Type: jpg img_4978.jpg (55.7 KB, 90 views)

Last edited by timo888; 09-16-08 at 06:07 PM.
timo888 is offline   Reply With Quote
Old 09-16-08, 08:57 PM   #2
itsmoot
in cog neato
 
itsmoot's Avatar
 
Join Date: Mar 2008
Location: Missouri
Bikes:
Posts: 357
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I guess SRAM doesn't make a top-pull deraillaur?
itsmoot is offline   Reply With Quote
Old 09-16-08, 09:39 PM   #3
jur
Senior Member
 
Join Date: May 2005
Bikes:
Posts: 6,830
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 21 Post(s)
Quote:
Originally Posted by itsmoot View Post
I guess SRAM doesn't make a top-pull deraillaur?
Even with top pull you'd still need a cable housing stop. This solution is self-contained.
jur is offline   Reply With Quote
Old 09-16-08, 10:37 PM   #4
itsmoot
in cog neato
 
itsmoot's Avatar
 
Join Date: Mar 2008
Location: Missouri
Bikes:
Posts: 357
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Don't get me wrong, I'd prefer bottom-pull over top for the wider selection of front ders. I'd just figured from earlier discussions they were going to use top-pull.

It would look classy if the (guide?) wheel stays brass in the production version.
itsmoot is offline   Reply With Quote
Old 09-17-08, 07:39 AM   #5
invisiblehand
Part-time epistemologist
 
invisiblehand's Avatar
 
Join Date: Jun 2005
Location: Washington, DC
Bikes: Jamis Nova, Bike Friday NWT, STRIDA, Austro Daimler Vent Noir, Haluzak Horizon, Salsa La Raza, Hollands Tourer, Bike Friday tikit
Posts: 5,566
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 19 Post(s)
Nice. I always envisions something with avid rollamajig. Although, from appearances, it will suffer from the same problem as the Bike Friday front derailer setup since the pull angle is sort of from the side.
__________________
A narrative on bicycle driving.
invisiblehand is offline   Reply With Quote
Old 09-17-08, 09:29 AM   #6
fmattheus
Senior Member
 
Join Date: Dec 2007
Bikes:
Posts: 82
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
What problem does the bike friday front derailleur setup have?
fmattheus is offline   Reply With Quote
Old 09-17-08, 10:56 AM   #7
invisiblehand
Part-time epistemologist
 
invisiblehand's Avatar
 
Join Date: Jun 2005
Location: Washington, DC
Bikes: Jamis Nova, Bike Friday NWT, STRIDA, Austro Daimler Vent Noir, Haluzak Horizon, Salsa La Raza, Hollands Tourer, Bike Friday tikit
Posts: 5,566
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 19 Post(s)
Quote:
Originally Posted by fmattheus View Post
What problem does the bike friday front derailleur setup have?
I guess problem is the wrong word. But if the derailer mount gets bent -- not too hard with a folding bike -- then you have to bend it back to within a very narrow tolerance. Essentially, because the cable pulls to the side, the typical mount cannot maintain appropriate derailer alignment through multiple shifts to the big ring. This is after I increased the size of the "lock" washer -- not too sure what to call it ... but it is the washer on the opposite side of the derailer mount that creates a bigger surface area for the screw to hold the derailer in place -- and put sandpaper between the derailer and the braze on mount. Long story short, you have to bend the mount -- it is designed for this -- until it is (almost) perfectly faced such that the derailer is centered within the mount and parallel with the chainring. You have nowhere near the lateral tolerance experienced with a standard down pull front derailer.

Now that I think about it more, I suppose that much of this issue is corrected by having a bracket on the Swift since you can simply rotate the bracket around the seat tube. Although it might create a problem since you rather have the mount bend than the seat tube.
__________________
A narrative on bicycle driving.
invisiblehand is offline   Reply With Quote
Old 09-17-08, 12:51 PM   #8
Speedo
Senior Member
 
Speedo's Avatar
 
Join Date: Jun 2006
Location: Boston Area
Bikes: Univega Gran Turismo, Guerciotti, Bridgestone MB2, Bike Friday New World Tourist, Serotta Ti
Posts: 1,998
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
That looks pretty nice. Was there any word on how much they'd be charging for it?

Speedo
Speedo is offline   Reply With Quote
Old 09-17-08, 02:36 PM   #9
timo888
...poet...
Thread Starter
 
timo888's Avatar
 
Join Date: Jul 2008
Location: Mid-Atlantic USA
Bikes: bikes
Posts: 624
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by Speedo View Post
That looks pretty nice. Was there any word on how much they'd be charging for it?

Speedo
I don't know. Whatever the market will bear

Regards
T

P.S. I'm considering a SRAM iMotion 9 freewheel-version internal hub and the SRAM DualDrive. This front-derailer would be a good adjunct should I go for the iMotion and end up riding more frequently on steeper terrain.
timo888 is offline   Reply With Quote
Old 09-17-08, 03:14 PM   #10
datako
Senior Member
 
Join Date: Dec 2005
Bikes:
Posts: 217
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Seems an awful lot of faff when a hub gear can do the job, but you can't argue with market demand.
datako is offline   Reply With Quote
Old 09-17-08, 04:43 PM   #11
jur
Senior Member
 
Join Date: May 2005
Bikes:
Posts: 6,830
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 21 Post(s)
Quote:
Originally Posted by datako View Post
Seems an awful lot of faff when a hub gear can do the job, but you can't argue with market demand.
The hub gear option is more expensive, is heavier, there is less competitive choice, it is sold in fewer places, it is more difficult to remove a rear wheel, LBSs are often not competent to carry out repair and even adjustment jobs... I could go on.

The drawback is the huge chainwheels needed.
jur is offline   Reply With Quote
Old 09-17-08, 04:47 PM   #12
kb5ql
SWS: Small Wheel Syndrome
 
kb5ql's Avatar
 
Join Date: Aug 2006
Location: Palo Alto
Bikes: Bike Friday Pocket Rocket/PedalForce RS2/Specialized Rock Hopper Xtracycle/Periscope Hammerhead
Posts: 728
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by jur View Post
The hub gear option is more expensive, is heavier, there is less competitive choice, it is sold in fewer places, it is more difficult to remove a rear wheel, LBSs are often not competent to carry out repair and even adjustment jobs... I could go on.

The drawback is the huge chainwheels needed.
Or capreo hub.

Thanks for the solution ... NOW (1 year too late). Oh well.
kb5ql is offline   Reply With Quote
Old 09-17-08, 04:49 PM   #13
timo888
...poet...
Thread Starter
 
timo888's Avatar
 
Join Date: Jul 2008
Location: Mid-Atlantic USA
Bikes: bikes
Posts: 624
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by jur View Post
The hub gear option
  • is more expensive (CONCUR)
  • is heavier (CONCUR -- though SRAM iMotion freewheel version shaves some grams),
  • there is less competitive choice (at least 7 major choices of hub gear),
  • it is sold in fewer places (both are sold close enough to me),
  • it is more difficult to remove a rear wheel (SRAM and Rohloff are easy unlike Alfine),
  • LBSs are often not competent to carry out repair and even adjustment jobs (CONCUR on repair not on adjustment)
Comments interspersed.

Regards
T

Last edited by timo888; 09-17-08 at 05:17 PM.
timo888 is offline   Reply With Quote
Old 09-17-08, 09:49 PM   #14
jur
Senior Member
 
Join Date: May 2005
Bikes:
Posts: 6,830
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 21 Post(s)
The hub gear option datako (I think) and I were referring to is not the plain hub gear but the dualdrive option.
jur is offline   Reply With Quote
Old 09-18-08, 05:44 AM   #15
timo888
...poet...
Thread Starter
 
timo888's Avatar
 
Join Date: Jul 2008
Location: Mid-Atlantic USA
Bikes: bikes
Posts: 624
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by jur View Post
The hub gear option datako (I think) and I were referring to is not the plain hub gear but the dualdrive option.
The two of you must be communicating telepathically. I missed that completely. Unless you've had that debate elsewhere and now it takes only a few code words to summon up the argument, like the lifers in prison?

Jonesy, a new guy on the cell-block hears on his first night in prison:

216 (followed by laughter) ... a little later, 1753 (more laughter) .... 26 (uproarious laughter)... and then 155 (which is met by almost complete silence, just a few groans and hisses).

He has no clue what's going on and asks his cell-mate.

--Oh, we've been here so long, we don't bother to tell the entire joke; we just refer to them by number.
-- I see. But what was all that with 155?
--That's Smith. He's really bad at telling jokes.

Regards
T
timo888 is offline   Reply With Quote
Old 09-18-08, 10:14 AM   #16
itsmoot
in cog neato
 
itsmoot's Avatar
 
Join Date: Mar 2008
Location: Missouri
Bikes:
Posts: 357
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by jur View Post
The drawback is the huge chainwheels needed.
And often they require custom prep.

itsmoot 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 07:34 PM.