HOT: Active* forum members generally gain 5% discount at starbike.com store!
Weight Weenies
* FAQ    * Search    * Trending Topics
* Login   * Register
HOME Listings Articles FAQ Contact About




Post new topic Reply to topic  [ 7 posts ] 
Author Message
PostPosted: Mon Sep 30, 2013 8:03 am 
Offline

Joined: Mon Oct 13, 2008 11:20 am
Posts: 64
Location: Lausanne, Switzerland
I've had a set of Lightning cranks for a couple of years, but have used them on and off in my Specialized Tarmac SL4 frame with a BB30 bottom bracket because they tend to creak. The creaking comes and goes for several kms at a time, and I've tried several things to fix it. It's been exactly the same in two different SL4's (the first replaced after a car cracked the rear end) and both frames were noise-free when running a Shimano crank in BB30 bearings using some axle-thickening adapters (24mm to 30mm) from Specialized. So I was pretty sure that the problem was not the frames.

To use a Lightning crank in a BB30 frame, you need to use their adapters that press-in to the BB30 shell to make it wider, then regular BB30 bearings press-in to the adapters:

Image

I was pretty certain that the problem was the Lightning adapter cups moving inside the frame, especially because I could pull one side out with my fingers, and the other side wasn't much tighter. I emailed Lightning about this but they didn't offer any solutions. Based on things I read on this and other forums, I decided to try installing the adapter cups with Loctite 603 / 609 which should solve this sort of press fit issue, but the cranks still creaked and when I gave up and removed them for the last time, they still weren't in there very tight.

Because of all this, I haven't used the Lightning cranks for several months. Then when looking at other cranks I realized that the Lightning cranks are essentially BB386 cranks (30 mm axle, but designed for an 86mm wide BB), even though they are not described as such. I therefore decided to try some BB386 to BB30 adapters that FSA sells:

Image

These work with a different principle from Lightning's adapters in that you put the BB30 bearings into the frame as normal, and these FSA spacers effectively shorten the axle to be like that on a BB30 crank. I wasn't certain that they'd be the correct length, but they installed on the Lightning cranks perfectly, and with the bearing-preload adjuster turned in just half a turn they span really smoothly with no hint of play. I've now done a couple of long test rides and have had blissful silence. So I'm happy to be able to use my Lightning cranks once again.

I'm not overly keen having something with an FSA logo on my bike, but it's a small price to pay to get rid of all of that creaking.


Top
 Profile  
 
Posted: Mon Sep 30, 2013 8:03 am 


Top
  
 
PostPosted: Mon Sep 30, 2013 9:27 am 
Offline

Joined: Tue Aug 07, 2012 6:35 am
Posts: 188
Location: Parakai, New Zealand
Top effort Chris!


Top
 Profile  
 
PostPosted: Mon Sep 30, 2013 9:28 am 
Offline
Formerly known as CAADHEAD
User avatar

Joined: Sun Dec 21, 2003 8:32 pm
Posts: 1419
Location: WALES,UK
Only problems I can invisage is that the Lightning cranks aren't designed to use bearing that sit more inboard than where the original adapters place them, could the axle be strengthened in the area the original bearings would sit? But its a great solution and regarding the FSA logo's, acetone?

_________________
Ti or dye!

The Weenie formally known as CAADHEAD


Top
 Profile  
 
PostPosted: Tue Oct 01, 2013 4:13 am 
Offline

Joined: Sun Apr 25, 2010 6:29 am
Posts: 35
Hey Chris,
Does your Tarmac have the Delrin pressfit cups epoxied into the frame?

A few years ago, they just pushed the cups in, then they sent 3M 420 2 part with them, now the majority of them come epoxied in the frame.


Top
 Profile  
 
PostPosted: Tue Oct 01, 2013 6:56 am 
Offline

Joined: Mon Oct 13, 2008 11:20 am
Posts: 64
Location: Lausanne, Switzerland
My frame is the second-tier Pro model, not the S-Works (the 100 grams weight saving is not worth an extra $1000 for me). The frame therefore has a standard metal sleeve for the BB instead of the delrin cups pressed into the carbon - the delrin cups only seem to introduce one more potential loose fit, and so I'm happy to not have that system.

Taking another look at the installation, the preload adjuster ring is actually turned in about 3 full turns (not half a turn as I said in my original post), so is pretty much in the middle of it's range.

I'm not too worried about the cranks not being designed to have the bearings a little inboard - I was ready to give up on this crank anyway so if this causes any more problems over time then I'll just ditch it and won't be any worse off than if I hadn't tried this solution. I'll update this thread if I do have any further issues, but on a 80km ride yesterday with lots of climbing the cranks were again silent. :)


Top
 Profile  
 
PostPosted: Tue Oct 01, 2013 11:42 pm 
Offline
User avatar

Joined: Wed Sep 26, 2007 1:57 pm
Posts: 7404
Location: San Francisco, CA
I had to lube my spider interface. That worked. No BB30 adopter.

_________________
http://djconnel.blogspot.com/
Fuji SL/1
\


Top
 Profile  
 
Posted: Tue Oct 01, 2013 11:42 pm 


Top
  
 
PostPosted: Wed Oct 02, 2013 2:47 am 
Offline

Joined: Wed Sep 17, 2008 6:25 pm
Posts: 214
Location: Nashville!
Very elegant solution. :beerchug: Nicely done.

_________________
That's right, I said it!


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 7 posts ] 


Who is online

Users browsing this forum: Ekorre, Google [Bot] and 39 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  

   Similar Topics   Author   Replies   Views   Last post 
There are no new unread posts for this topic. Lightning cranks and Specialized carbon spider

in Road

dereksmalls

0

343

Fri Jan 10, 2014 10:19 am

dereksmalls View the latest post

There are no new unread posts for this topic. Cable stop replacement for Di2.

in Road

Thanh

1

204

Tue Jul 15, 2014 9:56 pm

Thanh View the latest post

There are no new unread posts for this topic. Alchemy Hub Recall -- Stop using every ORC-UL

[ Go to page: 1, 2, 3, 4, 5 ]

in Road

nothingman

61

5398

Wed Jul 16, 2014 4:57 pm

Zigmeister View the latest post

There are no new unread posts for this topic. S-Works Crank - MTB version fit road BSA + Lightning compat

in Road

BikeTart

5

653

Sun Nov 17, 2013 6:47 pm

bricky21 View the latest post

There are no new unread posts for this topic. Centaur BB creaking @ 700km

[ Go to page: 1, 2 ]

in Road

Devon

21

836

Mon Oct 21, 2013 7:55 pm

Monkeyboy3333 View the latest post


It is currently Mon Jul 28, 2014 8:32 am

All times are UTC + 1 hour




Advertising   –  FAQ   –  Contact   –  Convert   –  About

© Weight Weenies 2000-2013
hosted by starbike.com


How to get rid of these ads? Just register!


Powered by phpBB