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7mm Fender Clearance?

Old 04-22-22, 07:46 AM
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Kilroy1988 
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7mm Fender Clearance?

Hello folks,

I'd like to purchase some Velo Orange hammered fenders in 45mm preferably (50mm might barely squeak into the frame and I think will look too large) to match with a pair of 700c rims that I've got fresh 38mm tires on. I understand the clearance might be tight but I'm willing to fiddle with the fenders to get the fit correct - I just want to know if anyone with experience might suggest nixxing the idea completely because that obviously isn't enough space for some reason... Thanks in advance!

-Gregory
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Old 04-22-22, 08:13 AM
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I think it should work, the frame and fork clearance and installation will probably be the more important factors though.

If you can fit wider tires in your frame than youíre currently using, Iíd give the fenders a try. If you canít then there may not be clearance for the fenders.

Last edited by bboy314; 04-22-22 at 08:18 AM.
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Old 04-22-22, 08:19 AM
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Roger M 
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I ran into this same issue last year. I had some fenders stored away that I wanted to use on a project. They measured 45mm inside, and I had 38mm Gravelkings.

They're a pretty snug fit, but I've had no problems so far. I did have to notch the front fenderwhere it meets the fork legs. The clearance was too tight to 'pinch' or 'dimple' it, so I marked it and used a dremel and a cutoff wheel.

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Old 04-22-22, 09:00 AM
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Expect to fiddle. 28s with my 40mm Berthouds required a occasional fiddling and after that experience, I would not try 38s with 45s.
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Old 04-22-22, 09:15 AM
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Originally Posted by Roger M View Post
I ran into this same issue last year. I had some fenders stored away that I wanted to use on a project. They measured 45mm inside, and I had 38mm Gravelkings.

They're a pretty snug fit, but I've had no problems so far. I did have to notch the front fenderwhere it meets the fork legs. The clearance was too tight to 'pinch' or 'dimple' it, so I marked it and used a dremel and a cutoff wheel.

Forget the bike, itís the background that matters. If the sign is there, does that mean that Leilani Lanes is closed? If it is, Iím never visiting Ballard again.
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Old 04-22-22, 09:33 AM
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Originally Posted by Roger M View Post
I ran into this same issue last year. I had some fenders stored away that I wanted to use on a project. They measured 45mm inside, and I had 38mm Gravelkings.

They're a pretty snug fit, but I've had no problems so far. I did have to notch the front fenderwhere it meets the fork legs. The clearance was too tight to 'pinch' or 'dimple' it, so I marked it and used a dremel and a cutoff wheel.

Valuable info, with questions.
I've converted two 700c road bikes to 650C.
The biggest tire I can use is the GravelKing 38.
I want fenders, but am simply not sure I can use them.
Are there any general rules of thumb, or is it pretty much "give it a shot?"

My only successful fender build was a 27" conversion to 700C on a frame that had fender mounts already.
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Old 04-22-22, 09:54 AM
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Roger M 
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Originally Posted by Mr. Spadoni View Post
Forget the bike, itís the background that matters. If the sign is there, does that mean that Leilani Lanes is closed? If it is, Iím never visiting Ballard again.
Yeah, Leilani Lanes got bulldozed over ten years ago, making way for Apartments and stores. That pin has been a decoration at a Snohomish nursery for several years.
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Old 04-22-22, 10:07 AM
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Originally Posted by bamboobike4 View Post
Valuable info, with questions.
I've converted two 700c road bikes to 650C.
The biggest tire I can use is the GravelKing 38.
I want fenders, but am simply not sure I can use them.
Are there any general rules of thumb, or is it pretty much "give it a shot?"

My only successful fender build was a 27" conversion to 700C on a frame that had fender mounts already.
Yep, for me it's pretty much been "give it a shot". It helps to have tires in hand. With tires mounted and on the frame, you can get a general idea of the clearance at all the close contact points.

I do think it's possible to run fenders with less clearance, but it takes more time, and your wheels need to be true. Also, if I ever plan on any 'serious' gravel riding, I'll rum 35mm tires or remove the fenders.

Edit: I bought this as a frame and fork, so I'm not sure if it originally had 27" tires.
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Old 04-22-22, 10:13 AM
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Clearance requirements vary depending on usage of the bike, methinks.

If you want to put fenders on a bike you're riding on gravel often, you want lots of clearance. Tires can pick up rocks and rattle them around between tire and fender. The smaller the gap, the more you hear this. One bit gets stuck between the tire and fender, you can get this:



My "pure gravel bike" has 30mm of clearance:


Big Red, my "all rounder" has 20mm. I'll take this on fire roads that don't have huge ruts and chunky gravel:


A pure city bike can get by with less. This is my 2 speed kickback Raleigh Gran(d) Sport(s):
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Old 04-22-22, 12:52 PM
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Thanks for all of the information, folks. I'll just go with the 50mm fenders as it'll clearly be less hassle. The frame should just take them and the more snug they are between the stays the less they rattle around anyway, which is fine by me!

-Gregory
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Old 04-22-22, 01:01 PM
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Moe Zhoost
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Good choice going with the 50s. Having launched myself over the bars because of a jam between fender and tire, I now go minimum 10mm clearance.
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Old 04-22-22, 01:38 PM
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I have 38s under 45s and would be happier with 50s.
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