Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

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Old 12-24-18, 12:00 PM
  #926  
TugaDude
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Originally Posted by j_e_r_e_m_y View Post
Tried googling to answer this but am failing to find an answer. Does anyone know if there's a way to use a retro BMX style 3 piece crank like the GT Power Series (link below) or Redline Flite cranks on a bike with a standard 68mm bb shell? Just intrigued by the idea of adding a little old school BMX flair to my bike.

https://www.ridebmx.com/product/part...series-cranks/
I believe this would work. However, not for the newer GT cranks as the spindle grew to 22mm. You need a crank spindle of 19mm for these to work


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Old 01-12-19, 06:00 PM
  #927  
klhada
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Upping this tread with a question: how much can my frame flex? Bike is a Langster street, size 58, with Sram Omniuns. Sorry for the bad picture, but it shows that I can put a pencil between the frame and chainring, and it's almost one finger of clearance in the part where the chainring would contact the frame.

BUT, cleaning the bike today, I found some weird scratches on the paint in that part (right now covered by tape). I can post pictures of the scratches lately, but it REALLY looks like the chainring touched the frame. The scratches were a bit deep. Can the frame flex that much, moving more than 1cm in the chainring area? Right now I weight 90kg, and use the bike on some good climbs. I used some black tape to cover the scratches, just as a guide. I will try to go to the hard climb tomorrow, and see if it touchs the frame. If so, I'm actually scared to use the bike
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Old 01-12-19, 08:49 PM
  #928  
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Originally Posted by klhada View Post


Upping this tread with a question: how much can my frame flex? Bike is a Langster street, size 58, with Sram Omniuns. Sorry for the bad picture, but it shows that I can put a pencil between the frame and chainring, and it's almost one finger of clearance in the part where the chainring would contact the frame.

BUT, cleaning the bike today, I found some weird scratches on the paint in that part (right now covered by tape). I can post pictures of the scratches lately, but it REALLY looks like the chainring touched the frame. The scratches were a bit deep. Can the frame flex that much, moving more than 1cm in the chainring area? Right now I weight 90kg, and use the bike on some good climbs. I used some black tape to cover the scratches, just as a guide. I will try to go to the hard climb tomorrow, and see if it touchs the frame. If so, I'm actually scared to use the bike
thats crazy! I guess anything is possible. Some quick and obvious questions. Does the chain ring seem to be spinning true? Does ur bottom bracket appear to be straight? Everything tight, no slop?
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Old 01-13-19, 01:30 PM
  #929  
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yeah, everything works fine. Today I rode 94km with the bike, and nothing out of ordinary.

BUT, then it hits me. If the frame flexed that much, it would be impossible to ride, since I use a rear brake as well. It would touch the rim far before the chainring hit the stays (and THAT I know how it feels).

So, maybe it was just some gravel/whatever which got stuck in that exactly place.
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Old 01-13-19, 08:52 PM
  #930  
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Originally Posted by klhada View Post
yeah, everything works fine. Today I rode 94km with the bike, and nothing out of ordinary.

BUT, then it hits me. If the frame flexed that much, it would be impossible to ride, since I use a rear brake as well. It would touch the rim far before the chainring hit the stays (and THAT I know how it feels).

So, maybe it was just some gravel/whatever which got stuck in that exactly place.
Possibly. I would think you would feel something funky going on if it were flexing that much. And you would probably hear and feel something if it was mashing into your chainstay. Odd, Id just keep a close eye on it for the time being
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Old 01-13-19, 09:42 PM
  #931  
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An aluminum frame should never flex that much. It's possible you picked up something that got stick in your chainring, and when it scratched the chainstay it knocked itself off.
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Old 01-13-19, 10:08 PM
  #932  
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Originally Posted by klhada View Post
1 - Rode with double brakes and without straps. Worked fine, but will I die soon? In one of the descents, my feet slided on the pedal, but not enough to lose contact..
Maybe, everyone says that you will. I ride mine that way though without issue, just use my brakes when my cadence gets to about 130.
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Old 01-13-19, 10:14 PM
  #933  
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Originally Posted by wphamilton View Post
Maybe, everyone says that you will. I ride mine that way though without issue, just use my brakes when my cadence gets to about 130.
Never have I ever heard that. Foot retention seems like a good idea brakes or not
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Old 01-13-19, 10:23 PM
  #934  
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Originally Posted by mouse View Post


Never have I ever heard that. Foot retention seems like a good idea brakes or not
Never heard that you'll suffer a calamity and die if you don't use foot retention, or never heard of someone riding FG without foot retention?
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Old 01-14-19, 12:21 AM
  #935  
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Originally Posted by wphamilton View Post
Never heard that you'll suffer a calamity and die if you don't use foot retention, or never heard of someone riding FG without foot retention?
It's a good idea for fixed gear drivetrains where there's no freewheel letting you coast.
Constantly driven by the rear wheel's inertia via the drivetrain, a fixed gear's pedals won't stop rotating until the wheels do.
It's not fun to have the skin on the back of your legs skinned by your pedals when your feet slip in a higher cadence.
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Old 01-14-19, 04:49 AM
  #936  
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well, since I'm the original poster of the actual responses, I might say that I still use double brakes, but now use SPDs Less pratical, but easir on the mind, and specially helpful on the climbs
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Old 01-15-19, 10:26 AM
  #937  
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It doesn't get much interest nowadays, but wayyy back when, there were more than a few discussions here about very light wheelsets, and what parts to use to build your own...

Some of the hubs that got a lot of love for this purpose were low spoke hole, low flange Novatec & Gran Compe SF. Maybe it's the times, but I've been checking around the interwebz lately and I couldn't find low hole versions of these hubs. Retrogression carried the Gran Compes but was out of stock the latter part of last year, and who knows what they will be doing after their move. I've also asked several LBS around me about ordering them and been told that none of their distributors have them. I've run into a brick wall.

So my question for the group is - does anybody know anywhere that one can currently buy low spoke count, low flange Novatec or Gran Compe SF hubs in Silver?

TIA...
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Old 01-15-19, 07:39 PM
  #938  
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^^ Maybe try Alex's Cycles.
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