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The Bike Shop / Re: converting bike with gears to single speed?
« Last post by jonathan on August 09, 2019, 08:28:35 PM »
are you still interested in converting to single speed? if the dropout does not allow room to move the axle, you can do one of two things:
find a "magic gear". play around with the cogs on the rear wheel until you find one that works with the front chainring and keeps the chain tight. this is a ghetto, temporary solution. it only works a chain that is worn to exactly the degree to which the current chain is. when the chain wears more or you replace it, it won't work anymore.
chain tensioner. there are a ton of these on the market. A Shimano Aline tensioner might work, but if you remove the cable from a derailer and adjust it such that it cannot move laterally, you've made a ghetto tensioner that will work just fine.

the front rings and rear cogs on a bike that was designed to shift won't hold the chain in one place very well, especially if the chainline is not spot-on.

adjusting shifters and derailers is not difficult. you just have to take a few minutes to understand how to set the two limit screws, set the cable tension so it effectively pulls the derailer across all the gears, and set the b-screw so it spaces the jockey pulleys from the cassette. this is all very simple after a few Park Tool videos.

if the drivetrain is old or out of whack in any way, things won't work so smoothly. you might need to replace cables, housing, or drivetrain parts- a worn out cassette, chain, or chainring won't shift well. make sure the derailer hanger is straight and perpendicular to the center of the bike.

you might be able to remove the left shifter and lock out the front derailleur by cinching down the limit screws on it until the derailer stays in one place, keeping the chain there, probably on the center ring.

all this trouble with front triple chainrings is why most modern mountain bikes have only one front chainring and very few other bikes have more than two chainrings.

for an old road bike with a thread-on freewheel, you can get the chainline close enough to work by rebuilding the rear wheel. replace the freewheel with a single-speed freewheel and swap the axle around so the drive side spacers are on the opposite side of the hub. this will throw the rim off-center, so you'll need to dish the wheel. you might be able to pull this off by adjusting the spoke tension, but you might end up with too much nipple engagement on the right side and not enough on the left. the answer to that is to rebuild the wheel with the spokes on the opposite side of the hub. this is time consuming, but if you're used to building wheels, its no big deal.

if your rear wheel has a freehub designed for a multi-speed cassette, you should buy a single-speed cog (Surly!) and some spacers to line it up with the front chainring. if you can get a hold of some old cassette spacers from a worn out cassette, you can use those too. in a pinch, a carefully selected range of PVC pipesegments will do most of the spacing.
32
Sell and Swap / Re: aluminum fly ruben pedals
« Last post by andtitlefight on August 09, 2019, 02:21:14 PM »
Still available?
33
The Bike Shop / Re: another new freecoaster - planetary gear engagement
« Last post by MEAT on August 08, 2019, 10:47:53 AM »
He's got fabulous hair, i trust him.
34
Sell and Swap / Re: WTB 21 frame
« Last post by paranoidmexican on August 08, 2019, 08:31:34 AM »
would 20.75 be ok? i have a full chromo fit complete frame i'd sell you for like 40 shipped.

Can you snap me a pic of it please? Dm me on insta @billdaddii

hey man my bad, i ended up selling that whole bike recently
35
A no-slack coaster that explodes if you pedal forward. What could go wrong?
36
The Bike Shop / Re: another new freecoaster - planetary gear engagement
« Last post by JFax on August 08, 2019, 06:10:10 AM »
Could probably make it female in a similar way the z-coaster works.

Got myself a Salt coaster a while back and it kinda broke. Just got myself a z-coaster and it might just be me but I am not impressed how it works, spins really badly. Gonna put it on the test.

37
The Bike Shop / Re: Quick Questions
« Last post by ediotism on August 08, 2019, 01:11:07 AM »
anyone got one of those tiny Rocker bmx? my brother bought one for a laugh, a lot of the parts are interchangable with an actual bmx e.g. stem bars cranks seatpost etc, but the wheels are heavy as fuck... due to their peculiar shape and size i suppose

anyone got suggestions for lightning up the wheels? the rear is currently a 10mm male axle freecoaster, where the hubshell also acts as the spokes and rim a-la mag wheels

and a brief look suggests it uses a spacing wider than the bmx 110mm
38
The Bike Shop / Re: converting bike with gears to single speed?
« Last post by paranoidmexican on August 05, 2019, 10:48:50 AM »
maybe he should just do footjam nosepicks to stop

got the brakes worked out. funny enough, i really only use my front brake to stop lol
39
The Bike Shop / another new freecoaster - planetary gear engagement
« Last post by ediotism on August 05, 2019, 06:57:52 AM »
https://bmxunion.com/daily/inside-look-at-the-free-night-planetary-freecoaster-hub/

what does everyone think? pretty interesting concept although there're a few things im skeptical about

1. male axle in 2019?
2. if you pedal forward when in fakie, the internals can explode


anyway, super happy of some new innovation coming to market
40
The Bike Shop / Re: converting bike with gears to single speed?
« Last post by ediotism on August 04, 2019, 12:05:20 AM »
maybe he should just do footjam nosepicks to stop
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