Author Topic: Replacement forks for a Dave Russell bike  (Read 470 times)

Adam

  • It'll soon be summer
    • Charity ride Durness to Dover 18-25th June 2011
Replacement forks for a Dave Russell bike
« on: August 02, 2020, 04:01:21 pm »
Someone (not me) forgot they had a lovely road bike on their roof rack and had a slow speed impact with a barrier. 

https://photos.app.goo.gl/XRWJaoA4G21VMVtW9

The frame itself looks ok, but the front wheel got pringled and the forks are very slightly bent.  Any suggestions for a decent replacement set of forks?
“Life is like riding a bicycle. To keep your balance you must keep moving.” -Albert Einstein

Re: Replacement forks for a Dave Russell bike
« Reply #1 on: August 02, 2020, 05:56:44 pm »
Threaded, I assume?  It's a case of searching the Bay Of Thieves for one with the right steerer and thread length.  If it has a funny offset (race forks are almost always 43-45mm) you'll probably have to get one made.  Then there's paint, unless you get a chromed fork.

Argos will make a nice new one for £250 including paint, which could be competitive with buying a 531 fork from eBay and having it sprayed.  A new steerer is about £60 (plus paint) if you can't find one in the right length.

I can't believe the wheel crumpled like that.  Radially, a wheel should be stronger than the frame - or roof rack!
And Darkness and Decay and the Coronavirus held illimitable dominion over all.

Re: Replacement forks for a Dave Russell bike
« Reply #2 on: August 02, 2020, 06:18:26 pm »
A good frame builder may be able to straighten the forks. Worth asking. Steel can be good like that, within limits.

Wouldn't hold out the same hope for the wheel mind.

Re: Replacement forks for a Dave Russell bike
« Reply #3 on: August 02, 2020, 07:52:46 pm »
Any of the steel frame builders could make a set of forks.

Before going too far with this though I’d do a very thorough check of the rest of the frame with a straight edge etc

Re: Replacement forks for a Dave Russell bike
« Reply #4 on: August 02, 2020, 08:02:43 pm »
My concern would be that the down tube is crumpled or the head tube has ovalised at the bottom cup.  A good tubeset will make the fork sacrificial but not all do (531DB would trash the frame before the fork in a head-on collision).
And Darkness and Decay and the Coronavirus held illimitable dominion over all.

zigzag

  • unfuckwithable
Re: Replacement forks for a Dave Russell bike
« Reply #5 on: August 02, 2020, 08:22:16 pm »
turn the forks around and ride into a wall few times, job done

Re: Replacement forks for a Dave Russell bike
« Reply #6 on: August 02, 2020, 08:31:10 pm »
The wheel must have been rolled under a square-section cross-bar, with a corner impacting first. Maybe.

Could be artifact but does anyone agree that it looks as if the crown is not sitting parallel to the bottom cup, suggesting a bent steerer?

I and some other members here witnessed a similar roof-rack event at the end of a FNRttC many moons ago.

Re: Replacement forks for a Dave Russell bike
« Reply #7 on: August 02, 2020, 09:20:23 pm »
I bought a Raleigh Twenty that had been ridden into something immovable.  The forks were scrap and the lower cup was partly dislocated but the head tube was actually fine.

If you do get new forks built, the DR crown can be re-used.  Crowns are pretty unaffected by brazing unless it's done by a neanderthal.
And Darkness and Decay and the Coronavirus held illimitable dominion over all.

Re: Replacement forks for a Dave Russell bike
« Reply #8 on: August 03, 2020, 10:11:13 am »
A good frame builder may be able to straighten the forks. Worth asking. Steel can be good like that, within limits....

+1.  Forks can usually be cold-set.  Obviously check the rest of the frame carefully too.

cheers


Re: Replacement forks for a Dave Russell bike
« Reply #9 on: August 03, 2020, 10:55:08 pm »
My concern would be that the down tube is crumpled or the head tube has ovalised at the bottom cup.  A good tubeset will make the fork sacrificial but not all do (531DB would trash the frame before the fork in a head-on collision).

Loctite (638 iirc) is your friend in the latter case. My Gillott’s lower cup was removable with a finger and opposing thumb, or gravity:( 638 fills small gaps and ‘retains’ bearing, cups etc.

https://m.youtube.com/watch?v=H5987No-F7A

Adam

  • It'll soon be summer
    • Charity ride Durness to Dover 18-25th June 2011
Re: Replacement forks for a Dave Russell bike
« Reply #10 on: August 04, 2020, 09:23:49 pm »
Thanks for all the above comments.

The wheel must have been rolled under a square-section cross-bar, with a corner impacting first. Maybe.

Could be artifact but does anyone agree that it looks as if the crown is not sitting parallel to the bottom cup, suggesting a bent steerer?

I and some other members here witnessed a similar roof-rack event at the end of a FNRttC many moons ago.

Yes, the steerer is bent.  The actual forks look absolutely fine, with no visible evidence of damage.  I'll do some dismantling to check if it's no longer circular around the lower cup.
“Life is like riding a bicycle. To keep your balance you must keep moving.” -Albert Einstein

Re: Replacement forks for a Dave Russell bike
« Reply #11 on: August 04, 2020, 10:25:23 pm »
if the steerer is bent, the crown race will 'swash' when the forks are rotated.  If there is no 'swash' the steerer is straight and the deformation in the forks lies elsewhere.

There is something of a knack to straightening forks; generally speaking more can be done than you might at first imagine.

cheers

Re: Replacement forks for a Dave Russell bike
« Reply #12 on: August 05, 2020, 07:43:46 pm »
I've straightened them by hand, but that was just to correct a couple of mm of twist, where one dropout slightly leads the other.  Not when both are bent back.
And Darkness and Decay and the Coronavirus held illimitable dominion over all.