Front mudguards...

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Fast Eddie

Fast Eddie

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I’m going down the same road of hassle as Ken did in trying to find a suitable mudguard for a 100/90/19 Avon Roadrider.

It ain’t as easy as it seems... the tyre has a large rolling radius, and is quite a large OD at its edges too. And, of course, tyres grow at speed.

Does anyone know how much a tyre grows and how much clearance is needed? I’m thinking I need about 1/2”.

Ken, would you mind posting a pic of your set up?

Anyone else have any good ideas?

All ideas welcome ... apart from changing to a smaller tyre or rim !!
 
Not quite sure what your question is... I run 100/90/19's with stock mudguard on my '74 with no issues. Wasn't the K81 even wider?
 
Fair point Maylar, I didn’t clarify... my issue is that due to running a none standard disc, and wanting to minimise weight, I don’t want the stock set at requires stays fore and aft.

I had a cNw one but the tyre rubbed inside. These are heavier than I’d like, but I liked the fact it also acted as a bit of a fork brace.

However, I’ve since ridden the bike, on road and track, with any mudguard or brace, so I’m happy that the bracing aspect isn’t required.

So, the lighter the better...
 
Front mudguards...
I have a hinkley triumph one on my commando
I think it's from a thunderbird but not sure , it fits well to a 90/90 X 19" not particularly light though
 
Proddy racer front guard. Works for me. Still a tight fit with the 2.5 inch rim. Oh, and it looks cool. That seems to be the important thing these days.
 

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Fast Eddie said:
Fair point Maylar, I didn’t clarify... my issue is that due to running a none standard disc, and wanting to minimise weight, I don’t want the stock set at requires stays fore and aft.

I had a cNw one but the tyre rubbed inside. These are heavier than I’d like, but I liked the fact it also acted as a bit of a fork brace.

However, I’ve since ridden the bike, on road and track, with any mudguard or brace, so I’m happy that the bracing aspect isn’t required.

So, the lighter the better...
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Nigel I think a trip to your friendly neighborhood bike breakers is called for ... there must be quite a few Japanese sports bike front guards that could be adopted..
 
They can be made to any old shape and size. One evening to pound the thing out and another to wheel it smooth.

Glen
 
A Harley Sportster front guard with a little trimming of the mounts works well, you can buy repros on E- Bay all day for $50. I believe this is the basis of the CNW unit.
 
I thought the CNW Mudguard was made specially to fit a 100/90-19. On the photos it looks like there's plenty of space. I fancy a slim stainless mudguard and was thinking of a late T140.
IF you want light, then maybe alloy. Remember Trading in someone website, that they could roll you a alloy mudguard in one piece. Don't remember where.
Dan
 
Thanks for the pic Ken.

Glen, you make it sound easy, where do I send my order ??

Dan, ref the cNw guard, Matts own build all have 18” wheels, so there bags of clearence of course. I think he’s about to offer a new version though which resolves the 19” issue. But I’m now thinking I want lighter anyway.

Gortnipper, yes I’m sure the lack of a mudguard didn’t cause the issues as it started with the mudguard, it was better without it... (but I had also put in new fork oil)... he can sits got me thinking about the unsprung weight ...!

Thanks for the Hardly Dangerous suggestions gents, but it’s the weight topic again.

Cab, you’ll be the first to hear... poss Lansdowne dampers too...?
 
Minnovation do a fibre glass mudguard. Light weight and you get to drill your own holes.
 
Steves said:
Minnovation do a fibre glass mudguard. Light weight and you get to drill your own holes.
Click to expand...

I don’t think the ears are quite long enough. It looks the same as the Andy Molnar version I have, and the ears are 1/2” too short.

I guess that’s cos most racers are running 18”.
 
Yes, Ron’s bike had the mudguard I was referring to, I think it’s lighter than a standard Norton one with stays and the mounting is quite strong enough to act as a fork brace.
 
Fast Eddie said:
Dan, ref the cNw guard, Matts own build all have 18” wheels, so there bags of clearence of course. I think he’s about to offer a new version though which resolves the 19” issue. But I’m now thinking I want lighter anyway.
Click to expand...

Eddie,

This information is incorrect. I do not use 18" front wheels, nor have I ever, on my standard builds. They are 19" (only exception are the Cafe's that use a 18"/17" wheel combo). So on my std builds they get a Bridgestone BT45 100/90-19" and I do not have any problems. Been using this set up for 12+ years and they work great. At times when the tire picks up a rock, there can be contact.

As been mentioned several times in the countless 'perfect wheel size' threads, the manufactures vary greatly as far as the actual size of a tire. An Avon is not the same dimensionally as a Bridgestone. Even within manufacturers, sizes will vary based on the model tire. I use a 120/90-18" BT45 in the rear and it's a great fit with room to move from side to side. A customers really wanted Continental tires on his build and I had to go to a 110/90-18" rear in order to make that fit in the Commando swingarm

So when you shop for fenders, the actual tire certainly has to be taken in consideration if you want that tight fit. If you are not worried about MX spacing between the two, then it's not as important of course

Good luck finding the right fender for your application

Matt / Colorado Norton Works
 
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