torn thread on cranks

[emreoral_tr]

hi i'm new
but i am planning on buying this bmx with dk cranks but it says that the drive crank's pedal thread it worn and the pedal is welded to the crank.
how safe and reliable is this?

cheers

[mx_599]

hi i'm new
but i am planning on buying this bmx with dk cranks but it says that the drive crank's pedal thread it worn and the pedal is welded to the crank.
how safe and reliable is this?

cheers
welcome!

safe...questionable, reliable...well until it breaks anyway. i wouldn't worry about it too much if you're just getting the bike and starting out. if you're going to be doing major jumps with it you might want to consider buying replacement parts before it breaks.

good luck! and be sure to wear a helmet

[emreoral_tr]

well. i dont plan to do anythin big yet. jst dropping things, ramps. could you just take a look. here's the link

http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=7216745142&rd=1&sspagename=STRK%3AMEWA%3AIT&rd=1

thanks

[mx_599]

well. i dont plan to do anythin big yet. jst dropping things, ramps. could you just take a look. here's the link

http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=7216745142&rd=1&sspagename=STRK%3AMEWA%3AIT&rd=1

thanks
i looked at it...i wouldn't do what you said above without at least replacing the welded parts. if that factors heavily into what you can afford, you might want to look for another bike :)

[emreoral_tr]

thanks that was very helpful

[sxe fbm rider]

that's also a very small sprocket so you will have to get a cassette hub to run it.. but you can always change the sprocket.. I would get it and just get a replacement crank arm and pedal.. yuo could probably ask around at bike shops and friends and get something that will work if money is an issue.. I've had friends do simialr things, but it does eventually break and that's some one else's weld, so you dont know whats going on with it.

[CMcMahon]

Buy a pair of Odyssey 41 Thermals; they're the same cranks as the DK Chopsticks, except that they're heat-treated and have a lifetime warranty.

[FMFBMX]

I really would look into getting something that comes with everything you need. It may be a ok bike. But after throwing money into it after a while and buying a new rear wheel and your going to get a new chain and when u get a new chain you will want a new front chainwheel because thats how it goes when your replacing a chain or any part of the drivetrain because the chain basically molds to the current set up you have, rear wheel 40 dollars, chain 20, freewheel 15 front chainring 20. It all adds up. I would just spend more money and get a brand new bike, you will end up saving more money. Easily. atleast I think so..
Also when the pedals break... ur going to have to pay for new pedals that can be expensive and a crank arm just adds on to everything else you have got. so I think it is a bad idea.

[FMFBMX]

looks like it needs a seatpost and seat. that isnt cheap...

[CMcMahon]

when u get a new chain you will want a new front chainwheel because thats how it goes when your replacing a chain or any part of the drivetrain because the chain basically molds to the current set up you have

Technically true, but chains usually don't last nearly as long for us as they do with roadies, who actually run into that problem. I change my chain 2-3 times a year, and use the same sprocket for years (unless I change my gear ratio), and I never get issues like that.

[hypersnazz]

- By the time you replace rear wheel, cranks, pedals, seat, post and grips you're already into this bike a good deal more than what they're asking for it, which isn't a solid deal anyway. Save your money.

- Welds weaken steel (with the exception of high-end exotics like Reynolds 853 or True Temper OX Platinum), and this smells like a hack job anyway...2 strikes against. Pedals are not designed to be welded to crank arms, and this joint will fail sooner or later, I can almost guarantee it.

- If you change your chain regularly it will not damage your sprocket/cog. Measure 12 links with a ruler, a new chain will measure exactly 12". If the chain is stretched past the 1/16" mark, the chain should be replaced but the sprocket/cog will likely be undamaged. If it measures past the 1/8" mark you MAY be wearing out teeth. The only way to know for sure: put a new chain on...if it skips, you're into it for another couple bucks replacing sprocket and/or cog.

- I wind up having to replace my road bike chain every 2-3 months, FAR more often than Beerman replaces his BMX chain. It all depends on how often/hard you ride. Just because I'm not thrashing around on my road bike doesn't mean it's leading an easy life. ;)

[CMcMahon]

Measure 12 links with a ruler, a new chain will measure exactly 12".

24 links corresponds with 12"; links are 1/2" long.

edit: Yeah, but compare the miles put on a road bike in that given time compared to the number of miles put on a BMX bike. That's why you're replacing chains so often.

edit: Ah, I see where that comment comes from now. Take what I said about how long chains last and make it vice-versa (although what I incorrectly stated before did apply to me in my RSD/sprocket grind days).

[hypersnazz]

24 links corresponds with 12"; links are 1/2" long.

A 'link' consists of both an inside and outside link. Only half-link chains defy this, hence the name.

[CMcMahon]

Touché.

[hypersnazz]

Touché.

To your credit, that does confuse people. :)

Road bike drivetrains ARE considerably more delicate as well...a 9spd chain typically lasts me about 2000-2500 miles (around 1500-2000 for 10spd) and the likelihood that a stretched chain will damage a cassette is MUCH higher on a road bike.

Basically if it's not skipping when you replace the chain, the sprocket/cog is fine.

[CMcMahon]

Well, don't let our little racer friend know about that, OK? Those BMX racing companies have to make their skrilla somehow, since racing is half as popular as it was a decade ago. It's much better for their pocketbooks if he's buying all new everything when his chain stretches a little bit.

[hypersnazz]

Well, don't let our little racer friend know about that, OK? Those BMX racing companies have to make their skrilla somehow, since racing is half as popular as it was a decade ago. It's much better for their pocketbooks if he's buying all new everything when his chain stretches a little bit.

*cough* Well, in the case of race bikes, the whole bike should be replaced when the chain wears out (every 4 or 5 races). Don't skimp on the CF headset spacers and Ti spokes.

[FMFBMX]

So, I was thinking of replacing my front chainring because I got those king hubs, and i got a new rear cog. Its obv. a single speed, do you think i should just keep my current chain and front sprocket, there isnt all that many miles on it. 300 at most?
I'm keeping the gear ratio the exact same.

[hypersnazz]

So, I was thinking of replacing my front chainring because I got those king hubs, and i got a new rear cog. Its obv. a single speed, do you think i should just keep my current chain and front sprocket, there isnt all that many miles on it. 300 at most?
I'm keeping the gear ratio the exact same.

...and your line of reasoning would be...?

[FMFBMX]

So, should I get a new chain and stuff or what?

[hypersnazz]

Reread the thread *caaaaaaaaaarefully*.

[FMFBMX]

I'm still not catching on.