drilling fork for lorider mounts

For discussions about bikes and equipment.
User avatar
foxyrider
Posts: 4541
Joined: 29 Aug 2011, 10:25am
Location: Sheffield, South Yorkshire

drilling fork for lorider mounts

Postby foxyrider » 6 Jun 2016, 7:41pm

It's coming up to touring and holiday season and with camping on the agenda, the need to carry more than 2 bags. Whilst my 'touring' bike, a Focus Mares, does the load carrying very well it doesn't have lorider mounts, last year I used the not very pretty Tubus hose clip method. It works, didn't budge but it's damn ugly.

It has occurred to me that maybe the forks could be drilled and fitted with a threadsert to dispense with the clamps. The forks are pretty solid aluminium jobs, it's a CX bike so they are very robust! Obviously warranty goes out of the window but they are almost out of that anyhow.

So question is - is this a reasonable idea? I'm looking at M5 threads in one side of each leg to fit a Tubus Logo rack. (the fork section is almost square which precludes any of the alternative clamp systems to be used.)

Please - no diatribes about bike loading!
Convention? what's that then?
Airnimal Chameleon touring, Orbit Pro hack, Orbit Photon audax, Focus Mares AX tour, Peugeot Carbon sportive, Owen Blower vintage race - all running Tulio's finest!

User avatar
robgul
Posts: 2911
Joined: 8 Jan 2007, 8:40pm
Contact:

Re: drilling fork for lorider mounts

Postby robgul » 6 Jun 2016, 9:02pm

Not the same material but I drilled and fitted Rivnuts to the front forks on my 1975 531 Galaxy - about 10 years ago - and have used low-riders and more recently a Blackburn front rack (over the wheel) albeit with relatively light loads - no problems ... so far!

Have to say that the racks I used did seem to have most of the load-bearing on the mudguard eye bolts down by the front axle.

Given that ali forks are going to be more substantial than 531 steel I'd go for it - just remember to measure, mark and measure again (twice!) before wielding the electric drill (and make sure the drill is close fit to the Rivnuts)

Rob

alexnharvey
Posts: 809
Joined: 10 Jan 2014, 8:39am

Re: drilling fork for lorider mounts

Postby alexnharvey » 6 Jun 2016, 9:35pm

I would be very concerned that it would weaken the fork or cause a site where cracks could propagate from leading to catastrophic failure. More so in Alu than in steel although I wouldn't do it on steel either.

I think this is absolute madness!

Brucey
Posts: 35939
Joined: 4 Jan 2012, 6:25pm

Re: drilling fork for lorider mounts

Postby Brucey » 6 Jun 2016, 9:40pm

I wouldn't do it; not in a million years....

cheers
-------------------------------------------------------------------------------
~~~~~~~~~~~~~~~~~~~~~~Brucey~~~~~~~~~~~~~~~~~~~~~~~~

PT1029
Posts: 670
Joined: 16 Apr 2012, 9:20pm

Re: drilling fork for lorider mounts

Postby PT1029 » 6 Jun 2016, 9:47pm

Drill a hole in Aluminium forks, never if it was my bike.
Forks will be susceptable to metal fatigue (all the road vibrations), by removing some metal you will
1. Increase the fatigue as the stress will have gone up (you drilled some of the metal out)
2. You will have created a stress raiser (ie extra stress to the surrounding metal) which aids the formation/propogation of cracks.

The threadsert will have no tensile strength at the join (unlike something welded/brazed into a fork), so won't help the fork.

Stick to a clamp on method, or replace the forks for ones made with bosses.

I might be willing (possibly...) to drill a hole in aluminium forks if I had access to an aerospace metal (X ray?) crack detector to use before/after each ride... possibly.... but I wouldn't be able to take said detector on holiday....

Cheers
I think Brucey says it more suscinctley!

Tangled Metal
Posts: 5841
Joined: 13 Feb 2015, 8:32pm

Re: drilling fork for lorider mounts

Postby Tangled Metal » 7 Jun 2016, 12:12am

Swap out the forks. You can get them for about £70 with the necessary bosses. Just need to get the same geometry for the forks.

User avatar
DaveP
Posts: 3227
Joined: 9 Mar 2007, 4:20pm
Location: W Mids

Re: drilling fork for lorider mounts

Postby DaveP » 7 Jun 2016, 8:28am

...or make a tidier clamp?
I know what you mean about the Tubus approach, but for a couple of weeks I can look the other way.
Please don't drill your forks - remember Box Girder Bridges?
Trying to retain enough fitness to grow old disgracefully...

Vorpal
Moderator
Posts: 17311
Joined: 19 Jan 2009, 3:34pm
Location: Not there ;)

Re: drilling fork for lorider mounts

Postby Vorpal » 7 Jun 2016, 8:46am

Brucey wrote:I wouldn't do it; not in a million years....

cheers

+1

Buy new forks, try a different clamp system, or live with the ugly.
“In some ways, it is easier to be a dissident, for then one is without responsibility.”
― Nelson Mandela, Long Walk to Freedom

User avatar
foxyrider
Posts: 4541
Joined: 29 Aug 2011, 10:25am
Location: Sheffield, South Yorkshire

Re: drilling fork for lorider mounts

Postby foxyrider » 7 Jun 2016, 8:57am

Guess it's the hose clamps then!

Another pair of forks isn't easy on this machine - conical headset/steerer, disc brake and extra long - don't think i'll get one off the shelf or for less than £150!
Convention? what's that then?
Airnimal Chameleon touring, Orbit Pro hack, Orbit Photon audax, Focus Mares AX tour, Peugeot Carbon sportive, Owen Blower vintage race - all running Tulio's finest!

Vorpal
Moderator
Posts: 17311
Joined: 19 Jan 2009, 3:34pm
Location: Not there ;)

Re: drilling fork for lorider mounts

Postby Vorpal » 7 Jun 2016, 9:11am

You could try an Old Man Mountain rack?

http://www.oldmanmountain.com/category/ ... sc-qr.html shows some of the front racks; they make low rider style front racks for most bike configurations. IMO, they are decent looking rack, but they aren't cheap. They can do custom ones if you don't find what you fancy.
“In some ways, it is easier to be a dissident, for then one is without responsibility.”
― Nelson Mandela, Long Walk to Freedom

GranvilleThomas
Posts: 75
Joined: 1 Apr 2015, 9:58am
Location: Caerphilly

Re: drilling fork for lorider mounts

Postby GranvilleThomas » 7 Jun 2016, 9:43am

I honestly thought this was a wind up! Drilling holes in forks? Please don't do it what ever they are made of.

g.meredith
Posts: 67
Joined: 2 Nov 2012, 3:51pm

Re: drilling fork for lorider mounts

Postby g.meredith » 7 Jun 2016, 10:17pm

The Tubus hose clip method can only be described as god-awful. It is such an affront to the senses I shelled out for an extortionate Old Man Mountain.

reohn2
Posts: 36381
Joined: 26 Jun 2009, 8:21pm

Re: drilling fork for lorider mounts

Postby reohn2 » 8 Jun 2016, 9:28am

Vorpal wrote:
Brucey wrote:I wouldn't do it; not in a million years....

cheers

+1

Buy new forks, try a different clamp system, or live with the ugly.


+1
Mrs R2 has lived with ugly for 40 years,she seems to have got used,at least she doesn't hide behind the settee.
For my part I've lived with ugly for 63 years,and got used pretty(sic) early on :)
-----------------------------------------------------------
I cycle therefore I am.

Freddie
Posts: 2329
Joined: 12 Jan 2008, 12:01pm

Re: drilling fork for lorider mounts

Postby Freddie » 8 Jun 2016, 1:12pm

I have a front rack that clamps round the fork tubes that I could sell you. PM me if this is of any interest.

Tangled Metal
Posts: 5841
Joined: 13 Feb 2015, 8:32pm

Re: drilling fork for lorider mounts

Postby Tangled Metal » 8 Jun 2016, 1:38pm

What bike do you have? Contact Ghyllside cycles in Ambleside or perhaps spa cycles in Harrogate. I've spoken to the former and he seemed very confident that you could get replacement forks for anything included tapered steerers. IIRC mine is 1" - 1 1/8" tapered and he said that was no problem. I think he reckoned £70-90 possibly just over £100 if it's something a bit unusual.

Even at £100 It's cheaper than the prices I've seen for old man mountain racks by quite some ways. Pot just live with ugly. Ugly but functional is OK with me personally.