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Old 04-08-18, 06:44 AM   #1
chagzuki
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Increasing tyre clearance on Brompton front mudguard stay

I've been running a Greenspeed Scorcher on my Brompton front wheel for several years; clearance is tight and having just replaced it the newer one seems a touch wider than the previous. It tends to rub and I find myself trying to bend the stay every so often to center it around the tyre.

I've wondered if making my own mudguard stay might be possible with some sort of pipe bending tool... probably too tricky to get the geometry accurate since it's quite elaborate. Or perhaps some of the third party stays (featuring a different hook design) have greater clearance or some capacity to adjust clearance?

Any ideas?
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Old 04-08-18, 07:37 AM   #2
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You can make anything if you have the right skill level and only you would know your skill set. You need to answer your own question. I am a retired shop teacher and without seeing you build something and the tools you have to work with this is not an answerable question. The simple answer is it might be possible for you to make your own. Roger
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Old 04-08-18, 09:00 AM   #3
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Surely it would be a lot easier just to buy a thinner tyre..Your tyre is a 349 by 40mm..A Schwalbe Marathon is 349 by 37, Marathon plus is 349 by 35 , and the Kojak is 349 by 32..I do believe you can get a Marathon Racer as well and there is always the Brompton Green Kevlar which I think are great allround tyres..
Just seems to be a lot of trouble to go to just for the sake of a thicker tyre?
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Old 04-08-18, 10:21 AM   #4
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Away from the fork crown you can flatten a plastic fender a bit using a heat gun or hair dryer at high setting. Just progress carefully as messing up the fender completely is also possible this way. Stay bending is of course doable, but it does not sound as stays are your problem. When tolerances are tight then it is very easy to get things out of alignment - no reason to blame the stays specifically.

P.S. Don't grab heated plastic with bare hands as you can burn yourself badly - use gloves or tools to manipulated softened fender.

Last edited by 2_i; 04-08-18 at 10:23 AM. Reason: P.S.
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Old 04-08-18, 10:29 AM   #5
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I have chopped a front mudguard in 2, at the fork mount, then fit the front portion on in front of the fork ,
so the lowest clearance is the fork crown itself..

(just was not my Brompton I did this on)
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Old 04-08-18, 01:36 PM   #6
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Originally Posted by tudorowen1 View Post
Surely it would be a lot easier just to buy a thinner tyre..Your tyre is a 349 by 40mm..A Schwalbe Marathon is 349 by 37, Marathon plus is 349 by 35 , and the Kojak is 349 by 32..I do believe you can get a Marathon Racer as well and there is always the Brompton Green Kevlar which I think are great allround tyres..
Just seems to be a lot of trouble to go to just for the sake of a thicker tyre?
The Scorcher rolls much better and is so much more comfortable on rough roads, which unfortunately I'm stuck with. It also very slightly raises the front end which increases trail and slackens head tube angle, which positively affects the steering.
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Old 04-08-18, 01:38 PM   #7
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Away from the fork crown you can flatten a plastic fender a bit using a heat gun or hair dryer at high setting. Just progress carefully as messing up the fender completely is also possible this way. Stay bending is of course doable, but it does not sound as stays are your problem. When tolerances are tight then it is very easy to get things out of alignment - no reason to blame the stays specifically.

P.S. Don't grab heated plastic with bare hands as you can burn yourself badly - use gloves or tools to manipulated softened fender.
It's the side of the tyre hitting the stays, not the center. Or rather one side of the stays when they're not perfectly aligned (the clearance is very tight).
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Old 04-08-18, 02:11 PM   #8
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Hire a custom fork made with a wider fork crown, or just revert to running a regular 349-37 tire....
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Old 04-08-18, 02:45 PM   #9
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It's the side of the tyre hitting the stays, not the center. Or rather one side of the stays when they're not perfectly aligned (the clearance is very tight).
Possilbly you could make a stay that goes to the outside of the blade instead of to the inside. Should not be too difficult to make I'd assume.
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Old 04-08-18, 04:03 PM   #10
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You can raise the mudguard about a few millimetres if you enlarge the hole where the mudguard fits on the fork crown.The short sided stay on the right side could be bent out and easily lengthened with a small piece of metal with 2 holes drilled in it.. and a nut and bolt....The stay on the left looks as though it could be bent out a bit further..that might solve the problem..
Buy a fork from Ben in Kinetics in Glasgow ..He will make you one..so you can fit a fatter tyre..expensive though..

Last edited by tudorowen1; 04-08-18 at 04:06 PM.
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Old 04-08-18, 04:29 PM   #11
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It's the side of the tyre hitting the stays, not the center. Or rather one side of the stays when they're not perfectly aligned (the clearance is very tight).
As mentioned by @berlinonaut, you could make a stay that runs over the outside of the fender. For that, best would be to start with a stay made for larger wheels. Bending a stiff wire is not that straightforward and in the particular case the shapes at the two ends are the most challenging. You need round nose pliers, a vise and adjustable wrench for the purpose. I just seriously deformed the front stay after I changed the crankset to a double with a chainguard and wanted to keep the folding undisturbed. This required changing the shape of the front stay. The bending went fine but I only needed to modify the stay, not make a new one.
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Old 04-08-18, 05:15 PM   #12
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Originally Posted by chagzuki View Post
The Scorcher rolls much better and is so much more comfortable on rough roads, which unfortunately I'm stuck with. It also very slightly raises the front end which increases trail and slackens head tube angle, which positively affects the steering.
But does Scorcher roll that much better than Primo Comets slicks though slightly narrow and half as expensive?
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Old 04-09-18, 03:04 AM   #13
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I've not been able to get hold of Primo Comets in the UK.
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Old 04-09-18, 03:14 AM   #14
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Could titanium stays be easyer to bend? I just bought some for my B but did not install them yet. Also I am not keen on bending them just to find out but some of you may have the knowledge without testing first. An advantage to buying another set is that if you mess up you still have one set that works.

Maybe take a look at after market ones in general. If they are made differently they may have some more stay to play with (more lenght).

IMHO the best suggestions so far is to atatch them on top (if long enough) and/or making new ones from longer stays.

I`ll post some pix later today of what I did on my white folder and others. No need to bend the end of the stay to an eye at the end.
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Old 04-09-18, 10:52 AM   #15
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I've not been able to get hold of Primo Comets in the UK.

You could import them from Germany - for years I could not find a reliable source in Europe as well but currently a German shop sells them really cheap. I bought a pair there but did not try them out yet, so no idea how good they really are:

https://www.ginkgo-veloteile.de/gink...et-37-349.html
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Old 04-09-18, 01:12 PM   #16
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Primo Comet, I get them thru my local shop, got 4 last year.
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Old 04-09-18, 01:49 PM   #17
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Primo Comet, I get them thru my local shop, got 4 last year.
Possibly because you do not live in the UK but in the US...
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Old 04-09-18, 05:23 PM   #18
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Maybe he only shops online?
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Old 04-10-18, 01:24 AM   #19
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Maybe he only shops online?
Could not find your shop by typing "fietsbob's local bike shop" into google search... However - in the US it is not really tricky to find Primos, i.e. Hosteshoppe carries them: https://hostelshoppe.com/store/filte...-inch-(349mm)/

Problem is:
- at 26$ they are more expensive than the German shop I linked to
- tyipically, shipping cost from the us are horrendous
- plus you have to pay taxes and duties on import

As an European you'd end up much more expensive with importing from the US as with the German shop. So importing does not seem very attractive. For unknown reasons in Germany bike tires often are very cheap in comparison to to the price of the same tires in other countries like the US or the UK. I.e. at hostelshoppe a Kojak in 349 costs 31$, a Marathon green 32$ and a Marathon plus a whopping 52$. In a randomly picked internet shop in Germany known for cheaper tire prices the Kojak is 13,30 € (16,38 USD), the Marathon is 12,90€ (15,88 USD) and the Marathon plus is 20.90€ (25,74 USD). These prices already include taxes.
The Primo seems cheap also at 15€.

Just for the record: The local bike shops are far more expensive regarding tires over here, too and you won't get the Comet there at all. The 349 Scorcher is cheaper in the UK than in Germany, therefor I imported my scorchers from there.

Last edited by berlinonaut; 04-10-18 at 01:32 AM.
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Old 04-10-18, 03:22 AM   #20
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Cheap stays - possibly buy on Ebay, with or without guards, you can then modify the stay rather than starting from scratch
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