RADBMX.CO.UK

Technical & Reference Section => Tech and Restoration => Topic started by: telelogic on February 25, 2010, 05:52 PM

Title: Chain Rub?
Post by: telelogic on February 25, 2010, 05:52 PM

What is the procedure for stopping my chain rubbing on my seat stays?

Title: Re: Chain Rub?
Post by: QUADROPHENIA on February 25, 2010, 05:54 PM

 :wtf:

what bikes that on ?

Title: Re: Chain Rub?
Post by: telelogic on February 25, 2010, 05:59 PM

My new race Kuwa race bike.

Title: Re: Chain Rub?
Post by: QUADROPHENIA on February 25, 2010, 06:01 PM

bet horsehead built it thats why

Title: Re: Chain Rub?
Post by: telelogic on February 25, 2010, 06:05 PM

That's a massive help, Thanks!

Title: Re: Chain Rub?
Post by: QUADROPHENIA on February 25, 2010, 06:07 PM

no worries we are here to help






























get some pics up so we can looky

Title: Re: Chain Rub?
Post by: Gary72 on February 25, 2010, 06:49 PM

What size freewheel are you running? How far forward is the wheel?Are you running a skinny chain?I know Crooch had similar problems with a Chris King hub and a half-link chain.
Like Pete said get some pics

Title: Re: Chain Rub?
Post by: trasher on February 25, 2010, 09:34 PM

tighten the chain up  :-\

Title: Re: Chain Rub?
Post by: telelogic on February 26, 2010, 12:24 AM

It's a modern race bike, so the gearing is 16/44.

it looks like if I took a link out of the chain and shoved the wheel forward it might solve it, but that would be pretty slammed!

Title: Re: Chain Rub?
Post by: MartyC on February 26, 2010, 08:31 AM

Washers to push the frame out from the sprocket  :daumenhoch:

Title: Re: Chain Rub?
Post by: telelogic on February 26, 2010, 09:12 AM

Will that be OK with an alloy frame?

Title: Re: Chain Rub?
Post by: MartyC on February 26, 2010, 09:33 AM

Quote from: telelogic on February 26, 2010, 09:12 AM

Will that be OK with an alloy frame?

Should be so long as you don't over stress the frame, a small amount should be OK  :daumenhoch:  Is there any play between the cones and the inside of the croput if the wheel nuts are loose?

Title: Re: Chain Rub?
Post by: telelogic on February 26, 2010, 09:38 AM

croput?

Title: Re: Chain Rub?
Post by: HEYWOOD BMX on February 26, 2010, 09:44 AM

 Washers seem to be the sensible option,or you could see if a 43t ring would give you a bit more space between the chain & frame.One of those stick on neoprene/carbon patches on the inside of the stay would help to prevent any further damage.

Title: Re: Chain Rub?
Post by: telelogic on February 26, 2010, 09:50 AM

I've already stuck a patch on the seatstay to prevent any chipping.

Trouble is, It rub's on that like a bitch :knuppel2:

Title: Re: Chain Rub?
Post by: Dark Diggler on February 26, 2010, 09:52 AM

If its a cassette hub, take off the drive sprocket and move the spacers round so the cog is nearer the hub, if there is no spacers then usually flipping the sprocket will re space it nearer , this will allow the chain to clear the stays, also make sure your front sprocket is spaced correctly or your chain line will be fruity :daumenhoch:

Title: Re: Chain Rub?
Post by: telelogic on February 26, 2010, 10:01 AM

I'm sure the external BB isn't helping matters!

that must hold the sprocket a good centimeter further out than a normal BB?

Title: Re: Chain Rub?
Post by: Dark Diggler on February 26, 2010, 10:08 AM

Are there any spacers on the drive side of the BB? (between the external cup and the frame)

Get some pics up

Title: Re: Chain Rub?
Post by: MartyC on February 26, 2010, 04:29 PM

I should have asked this before, so just to clarify, is the chain rubbing on the Chain Stay or the Seat Stay?  The Chain Stay being the one that runs from the bb  to the dropout and the Seat Stay from the dropout to the seat tube?

If the Chain stay; is it rubbing at the dropout end ot the bb end?  Ifthe bb end sounds like the chain alignment is out of whack and spacers on the bb and the hub might be needed.

Pic would be helpful  :daumenhoch:

Title: Re: Chain Rub?
Post by: telelogic on February 26, 2010, 05:41 PM

Rubbing on the seat stay.

About three inches from the hub.

Title: Re: Chain Rub?
Post by: HEYWOOD BMX on February 26, 2010, 05:45 PM

PM Kuwahero,sure he had one of these,maybe he can help?

Title: Re: Chain Rub?
Post by: Gary72 on February 26, 2010, 08:55 PM

39-14

Title: Re: Chain Rub?
Post by: telelogic on March 03, 2010, 10:30 AM

will 39-14 have the same feel as 44-16?

Title: Re: Chain Rub?
Post by: HEYWOOD BMX on March 03, 2010, 10:36 AM

Quote from: telelogic on March 03, 2010, 10:30 AM

will 39-14 have the same feel as 44-16?

 Pretty much.Have a look at this,might help.

http://www.bmxultra.com/downloads/flash/gearchart.htm