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The Cycling Chat Thread

Have a slow puncture on rear tyre, suspect it's a faulty valve, if left for two days it's half deflated, but can pump it up fully and do 30 miles off road and it's still rock solid, so too idle to actually change the inner tube...
 
Cobblestones laid across cycle paths - what are they for? To reduce cyclists' speed?

(My first, inane but mercifully brief, thought was that they're the same sort of informative measure as in place for severely/sight impaired pedestrians approaching a crossing :facepalm: :D )
 
Cobblestones laid across cycle paths - what are they for? To reduce cyclists' speed?

(My first, inane but mercifully brief, thought was that they're the same sort of informative measure as in place for severely/sight impaired pedestrians approaching a crossing :facepalm: :D )

Need a pic for context/type of cobble really.
 
There’s some cobbled speed bumps around here, and I can remember some nasty ones in Norf Landen too. Absolute cunt’s trick, like cyclists were completely ignored when designing the traffic calming. Had one up Highbury way take out both my tyres once, had to walk a few miles home in the cold and dark as I only carry one spare tube and I’m shit at wheelies.
 
I’ve been enjoying late-night rides the last couple of weeks, past midnight. Roads are almost car free, a total joy to ride on, some good hurtling round the suburbs to be had. Only a few more weeks before they’re full up again at night with aggressively driven private hire vehicles and drunk students.
 
I have a fixie, built out of eBay and various other bikes. Here it is:

IMG_20210405_083908.jpg

I want to get rid of the horrific chain set and get a decent one and by decent I mean a huge front... er... cog? Like on a Brompton but obviously not exactly the same. When I first started riding again, about 6 months ago, I would pedal for around 5 revolutions and then think about what I was doing with my life whilst allowing the kinetic energy to wobble me on a few more feet and then start the whole process again whilst gasping like a smoker on a treadmill.

NOW?! Morning! Morninggggg! I give a cheery halloo to all and sundry, stood on the crossbar with my back to the bars, reading my latest book, sipping a macchiato. I can cycle up hill whilst sat down. I want to give myself a bit more of a challenge. I have just changed the chain because it got a bit stretched but I saved the rest of it so that's not a problem. What could I get away with and where do I get it from? eBay has zero choice except what is on my bike and then some parts made out of gold or something, judging by the price.

eta: apologies for just wafting into the thread btw.
 
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I have a fixie, built out of eBay and various other bikes. Here it is:

View attachment 261807

I want to get rid of the horrific chain set and get a decent one and by decent I mean a huge front... er... cog? Like on a Brompton but obviously not exactly the same. When I first started riding again, about 6 months ago, I would pedal for around 5 revolutions and then think about what I was doing with my life whilst allowing the kinetic energy to wobble me on a few more feet and then start the whole process again whilst gasping like a smoker on a treadmill.

NOW?! Morning! Morninggggg! I give a cheery halloo to all and sundry, stood on the crossbar with my back to the bars, reading my latest book, sipping a macchiato. I can cycle up hill whilst sat down. I want to give myself a bit more of a challenge. I have just changed the chain because it got a bit stretched but I saved the rest of it so that's not a problem. What could I get away with and where do I get it from? eBay has zero choice except what is on my bike and then some parts made out of gold or something, judging by the price.

eta: apologies for just wafting into the thread btw.
What size chainring do you currently have? What size is the rear?
 
Change out the rear sprocket then. Because of physics/ratios it has significantly more effect/tooth. And is a bit easier to find the right parts and swap over. And you can run a couple of different ones on a flip flop hub.
 
Change out the rear sprocket then. Because of physics/ratios it has significantly more effect/tooth. And is a bit easier to find the right parts and swap over. And you can run a couple of different ones on a flip flop hub.

Fair enough but I also want to get rid of the front chainset anyway. It is the last thing that I can lose some weight off the bike with, except me, obv.

eta: also, on that hub, one side is freewheel and the other is brake. Can I make them both freewheel? I very nearly killed myself trying out the brake side lol.
 
Thing is 48 is already on the large side for standard fixie parts. They certainly go bigger on track bikes (indoor racing) but dunno how part compatibility works. It will be cheaper and have a more significant effect changing out the rear.
 
Most cheapish single ring chainsets will have a ring in the 42-48t area because most people don't want to crank a huge gear up hills. Lighter chainsets with bigger rings can be fitted, but they won't be cheap. You put a hell of a lot of torque through a fixed gear so the chainring needs to be fairly chunky so that it doesn't just fold in half.
 
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