tartan pixie Posted February 11, 2008 Report Share Posted February 11, 2008 Is there any advantage of the isis system over 4 bolt with a splined bb? I run a race face crank/bb on my freeride bike (splined 4 bolt) and it works brilliantly so is there a good reason for people running chainrings that need a chain whip with scaffold pipe to remove?3 weeks till i can afford my new bike, i'll give you some peace from the stupid q's after that. Quote Link to comment Share on other sites More sharing options...
JonMack Posted February 11, 2008 Report Share Posted February 11, 2008 Well, you cant get chain rings smaller than 20t, so that's why people run screw on sprockets, because mods run 18:12 ratio and now so do some stock riders. Quote Link to comment Share on other sites More sharing options...
Jake Posted February 11, 2008 Report Share Posted February 11, 2008 Smaller the sprocket, the better the engagement. And as Jon says, because you need chainring bolts, and they can only fit on a certain size, which limits them to 20t.Screw-on sprockets have been around since the beginning. They are still used in track racing where there is a fixed engagement throughout (no freewheel at all). Quote Link to comment Share on other sites More sharing options...
ben_travis Posted February 11, 2008 Report Share Posted February 11, 2008 you sirARE WRONG Quote Link to comment Share on other sites More sharing options...
NVWOCI WVS Posted February 11, 2008 Report Share Posted February 11, 2008 screw in cog on fixed wheel bike = almost certain death Quote Link to comment Share on other sites More sharing options...
Al_Fel Posted February 11, 2008 Report Share Posted February 11, 2008 Front freewheels have to be screwed on which a lot of foolish people run. Quote Link to comment Share on other sites More sharing options...
Jake Posted February 11, 2008 Report Share Posted February 11, 2008 screw in cog on fixed wheel bike = almost certain deathI don't understand. I have a track bike, which, as is standard, has a fixed screw on sprocket held in place with a lockring, reverse threaded. For reference, here it is.you sirARE WRONGWrong about what. You can't just say that without offering some kind of insight into what is wrong, perhaps even helping the poster/me by telling me what you know that I don't. Quote Link to comment Share on other sites More sharing options...
NVWOCI WVS Posted February 11, 2008 Report Share Posted February 11, 2008 I don't understand. I have a track bike, which, as is standard, has a fixed screw on sprocket held in place with a lockring, reverse threaded.with a lockring and stuff its fine. But for obvious reasons a screw on sprocket on a fixed isn't going to work!Nice bike by the way Quote Link to comment Share on other sites More sharing options...
Jake Posted February 11, 2008 Report Share Posted February 11, 2008 Sorry, I don't understand what the obvious reasons are? Quote Link to comment Share on other sites More sharing options...
Skoze Posted February 11, 2008 Report Share Posted February 11, 2008 Sorry, I don't understand what the obvious reasons are?as you pedal in one direction or another, it would unscrew itself Quote Link to comment Share on other sites More sharing options...
Adam-Griffin Posted February 11, 2008 Report Share Posted February 11, 2008 I'm assuming travis means wrong about not being able to get non screw-on sprockets smaller than 20t, Thus the link in the smiley ? Quote Link to comment Share on other sites More sharing options...
*Tom* Posted February 11, 2008 Report Share Posted February 11, 2008 BB Drop!!! Quote Link to comment Share on other sites More sharing options...
N.Wood Posted February 11, 2008 Report Share Posted February 11, 2008 BB Drop!!! Hay man its his first trials bike, don't take the mick. Quote Link to comment Share on other sites More sharing options...
NicP Posted February 11, 2008 Report Share Posted February 11, 2008 BB Drop!!! Its a track bike who cares about the drop NicP Quote Link to comment Share on other sites More sharing options...
Jake Posted February 12, 2008 Report Share Posted February 12, 2008 as you pedal in one direction or another, it would unscrew itselfWell yeah, it would unscrew if you pedalled backwards, but unless you're a clown who works at a circus, I don't think you'd encounter that problem.EDITUnless, as I've just been informed, you slowed down and forgot it wouldn't coast. You'd fall off, but also the sprocket would come undone. Quote Link to comment Share on other sites More sharing options...
Mark W Posted February 12, 2008 Report Share Posted February 12, 2008 Without alockring if you slowed your pedalling to slow the bike down, that'd gently unscrew the sprocket too. Had a go on a guy's fixie who's sponsored by Charge, was pretty good fun. He's got a smaller frame with low-ish rise riser bars on, and it felt really nice to mess about on. The stuff he can do on it is amazing, full-speed pedal grinds, 360 hops, etc. Quote Link to comment Share on other sites More sharing options...
ben_travis Posted February 12, 2008 Report Share Posted February 12, 2008 if you click the link in the smiley face in my original post jake, it is possible to get bolt on chainrings smaller than 20t Quote Link to comment Share on other sites More sharing options...
JonMack Posted February 12, 2008 Report Share Posted February 12, 2008 (edited) Well yeah but isn't that actually a splined 18t for the rear hub but just using chainring bolts to screw into the bash? You couldn't actually fit it on standard cranks, it only fits on the C9 bash. Edited February 12, 2008 by JonMack Quote Link to comment Share on other sites More sharing options...
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