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Technical & Reference Section => Tech and Restoration => Topic started by: richardb on August 25, 2009, 12:44 PM

Title: Redline Flight instalation query.
Post by: richardb on August 25, 2009, 12:44 PM

Hi, Any help would be much appreciated;
I am trying to install a redline flight crank with a loose ball bottom bracket on an Aero Pro Burner. Whilst assembling the bottom bracket I am having trouble with the lock nut. There is only a very small amount of thread left for the lock nut that goes on after the lock washer.
It's as if the bottom bracket housing on the frame is too wide reducing the amount of threaded section left? I am using the bikes original bottom bracket cups which I have pressed into the frame. Should I be using Redline cups which are different?
Many thanks, Rich.

Title: Re: Redline Flight instalation query.
Post by: mark 2 on August 25, 2009, 01:02 PM

Cups will be the same - have you got the bearings in the right way around?

Title: Re: Redline Flight instalation query.
Post by: kuwahero on August 25, 2009, 01:02 PM

check you have the bearings the correct way round in the cups. there were only 4 or 5 threads showing on mine when I fitted the lock nut. seem to be ok though

Title: Re: Redline Flight instalation query.
Post by: moley on August 25, 2009, 01:24 PM

Yep!!  Bearing wrong way round is my first thought!!  ???

Title: Re: Redline Flight instalation query.
Post by: richardb on August 27, 2009, 02:39 PM

Yes pretty sure the bearings are in the correct way so the ball bearings rotate on the cups? The lock washer I have sits on top of what is a small recess. Is this correct? If this sat lower in the recess it may help me get the lock nut on. If not I shall just make do as you suggest and see what happens. Thanks again.

Title: Re: Redline Flight instalation query.
Post by: moley on August 27, 2009, 03:09 PM

Did you follow RATTY's Redline Flight Installation guide?

http://www.radbmx.co.uk/forum/index.php'topic=26518.0

Title: Re: Redline Flight instalation query.
Post by: richardb on August 27, 2009, 04:03 PM

Yes I printed out a copy so pretty sure I am doing it correct. Its the instruction numbered 11 thats causing me problems not having enough thread left for the locking nut.

Title: Re: Redline Flight instalation query.
Post by: moley on August 27, 2009, 11:07 PM

Assemble it!

Are there any gaps between the race and the cups?

Its not a sealed assembly so there will be a gap but it wont be huge.

If there is one then maybe your cups aren't deep enough for your bearings.

Whats the origin of all your components?

The Cups were already installed, what about the bearings?

Bearings can come in a variety of sizes and number of bearings?

Bearing retainers can come in 9, 10 and 11 bearings with 9 and 10 for most US BB and 11 for some Tange and more exotic 3 pc cranks.

Some UK Cranks are 9 ball but I dont know if these are BMX cranks or just old bikes from BITD like shopper bike and the like!

The top pic on RATTY's thread might be a 10 bearing retainer!!  ???

The 2nd set looks like 11.

Have you any different cups you can try?  :-\

Title: Re: Redline Flight instalation query.
Post by: Coastvl on August 28, 2009, 12:17 PM

What BB are you using? If it's a Mongoose Bb (28tpi) theres a recessed washer that catches a lot of people out. It has to sit inside the reccess or there won't be enough threads left for the locknut. I think the Tange BB is the same also.

Title: Re: Redline Flight instalation query.
Post by: richardb on September 01, 2009, 01:01 PM

Looks as if this may be the problem. If the lock washer sat in the recess this would give me enough thread. Do you know where I can get one that fits or would it be a case of filling the one I have down?

Title: Re: Redline Flight instalation query.
Post by: RATTY on September 01, 2009, 09:44 PM

I think Alans still has them in stock,if not try vertego :daumenhoch: