Author Topic: Raising front mudguard at fork crown - to improve clearance  (Read 821 times)

Raising front mudguard at fork crown - to improve clearance
« on: November 10, 2019, 12:01:31 am »
The vertical mudguard (Bluemels) fixing tab is prevented by the headset from going up any further.  It's kind of annoying because there's bags of potential clearance but I'm stuck with about 5mm of mudguard over the tyre - mud starts sticking/scraping.   I tried bending the tip of the vertical tab, but then found it tricky the get the mudguard to sit straight.

It's a design fault IMO /  bike design has changed.  My ancient (90s) bluemels, were fine.

Any ideas/fixes?
Destroying rainforest for economic gain is like burning a Renaissance painting to cook a meal.  EOW.

Kim

  • Timelord
Re: Raising front mudguard at fork crown - to improve clearance
« Reply #1 on: November 10, 2019, 12:27:41 am »
I bent the tab to fit the one on my Dawes, but I think I had a little more room to play with between the bolt and the crown race.  Some fiddling and harsh language was certainly involved, but it's fitting mudguards, so that's to be expected.

Pad it out with washers (or molish a custom spacer on your lathe) under the tab so the top of the tab can overhang the crown race?  Non-destructive, so probably worth a try.

Cutting down the tab would probably work (perhaps in combination with a larger washer).  Since it's clamped, does it matter if it's an open slot?  I don't like it as a solution though, it's bound to break.

Nuclear option: Remove the fixing entirely, drill a couple of holes in the mudguard (or re-use the ones where the rivets now aren't) and pass a cable tie through it and the mounting hole.
Careful, Kim. Your sarcasm's showing...

Re: Raising front mudguard at fork crown - to improve clearance
« Reply #2 on: November 10, 2019, 12:31:39 am »
The SKS tab is like this on my bike. I bent the top bit, above the bolt, back. It sits straight.

In theory, you could cut off the bit above the bolt.


Re: Raising front mudguard at fork crown - to improve clearance
« Reply #3 on: November 10, 2019, 07:46:51 am »
...  I tried bending the tip of the vertical tab, but then found it tricky the get the mudguard to sit straight.
...
Can you explain why the ‘guard wouldn’t sit straight? Or do you have a pic?
L'enfer, c'est les autos.

Re: Raising front mudguard at fork crown - to improve clearance
« Reply #4 on: November 10, 2019, 08:01:53 am »
I've increased clearance by chopping off the fitting, and using zip ties instead.



If the bottom of the brake is lower than the bottom on the fork crown, you may want a spacer of some sort.

zigzag

  • unfuckwithable
Re: Raising front mudguard at fork crown - to improve clearance
« Reply #5 on: November 10, 2019, 09:08:34 am »
as the bolt is holding only the mudguard, i would just add a spacer (e.g. 3-4 valve lockring nuts, simple washers, v-brake pad washers..) so that the tab clears the headset. a longer bolt might be needed.

Re: Raising front mudguard at fork crown - to improve clearance
« Reply #6 on: November 10, 2019, 09:10:09 am »
Here's mine:



My brake is bolt-on, the spacer is there because the back of the fork crown is not flat. Luckily, it brings the tab away from the headset and the brake bolt is just long enough.

Zip ties might actually reduce the gap depending on the thickness of the rivets and zip ties and how flat you can get the zip ties to lie flat on the inside of the mudguard. And they're fugly.

Re: Raising front mudguard at fork crown - to improve clearance
« Reply #7 on: November 10, 2019, 09:14:42 am »
Thanks all.   :thumbsup:

Probably me just not bending the tab evenly (with molegrips I think) & not having a good spacer...

Spacing out with washers would be easy, but yes, existing M5 hex crown bolts are stubby and not long enough.  edit. scavenged an old threadless headset cap bolt.   :)
Destroying rainforest for economic gain is like burning a Renaissance painting to cook a meal.  EOW.

Re: Raising front mudguard at fork crown - to improve clearance
« Reply #8 on: November 10, 2019, 10:07:17 am »
I bent mine in the same way but it certainly was a pain getting it to sit straight, I think it was just not having enough hands to hold the guard, light, then both ends to tighten it up!  Got there eventually though :)

Re: Raising front mudguard at fork crown - to improve clearance
« Reply #9 on: November 10, 2019, 11:42:38 am »

mcshroom

  • Mushroom
Re: Raising front mudguard at fork crown - to improve clearance
« Reply #10 on: November 10, 2019, 02:08:58 pm »
I went for spacers on mine around an awkward carbon fork fitting: -

Climbs like a sprinter, sprints like a climber!

Re: Raising front mudguard at fork crown - to improve clearance
« Reply #11 on: November 10, 2019, 02:51:12 pm »
The SKS tab is like this on my bike. I bent the top bit, above the bolt, back. It sits straight.

In theory, you could cut off the bit above the bolt.

That’s what I did, Dremel in hand.
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IanDG

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JonB

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Re: Raising front mudguard at fork crown - to improve clearance
« Reply #13 on: November 11, 2019, 09:19:52 am »
I've sawn through a couple on different bikes and they've been fine

Re: Raising front mudguard at fork crown - to improve clearance
« Reply #14 on: November 11, 2019, 09:37:04 am »
Common problem
I used Hubner's solution. Even with that, I only have about 3mm clearance for 37mm tyres. Real pain when roads are muddy (or I can regard it as resistance training).
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Cudzoziemiec

  • Dormant but requires tea
Re: Raising front mudguard at fork crown - to improve clearance
« Reply #15 on: November 11, 2019, 09:39:48 am »
Cutting the top of the tab off works better IME than bending it. However, as it's stainless steel, it's hard to cut through with a junior hacksaw! Why can't SKS make these tabs of aluminium?
The unwilling rider and the one who leaves each control in turn without reluctance, with no desire to come back, obviously cannot be making the same journey, even though their brevets are identical.

LittleWheelsandBig

  • Whimsy Rider
Re: Raising front mudguard at fork crown - to improve clearance
« Reply #16 on: November 11, 2019, 09:52:27 am »
Fatigue and corrosion resistance means that SS is a better option.
Wheel meet again, don't know where, don't know when...

Re: Raising front mudguard at fork crown - to improve clearance
« Reply #17 on: November 11, 2019, 10:02:22 am »
A piece that small and spindly in aluminium would disintegrate either as you hacksawed it or as you bolted it up.

Cudzoziemiec

  • Dormant but requires tea
Re: Raising front mudguard at fork crown - to improve clearance
« Reply #18 on: November 11, 2019, 10:13:31 am »
Fair points. I understand SKS have now moved to plastic for that tab but I'm not sure of the reasoning.
The unwilling rider and the one who leaves each control in turn without reluctance, with no desire to come back, obviously cannot be making the same journey, even though their brevets are identical.

vorsprung

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Re: Raising front mudguard at fork crown - to improve clearance
« Reply #19 on: November 11, 2019, 02:09:16 pm »
I've increased clearance by chopping off the fitting, and using zip ties instead.



If the bottom of the brake is lower than the bottom on the fork crown, you may want a spacer of some sort.

This will give the tightest clearance
On one of my bikes I've hacksawed off the top of the tab as suggested by others
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Kim

  • Timelord
Re: Raising front mudguard at fork crown - to improve clearance
« Reply #20 on: November 11, 2019, 08:30:07 pm »
Cutting the top of the tab off works better IME than bending it. However, as it's stainless steel, it's hard to cut through with a junior hacksaw!

I'd probably reach for the Dremel for that one...
Careful, Kim. Your sarcasm's showing...