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Old 01-28-13, 08:54 AM   #1
kjmillig
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Fenders for 700x40c tires?

I have Kenda Courier 700x40c tires. When they're pumped up to 80 psi they lightly rub my rear fender on both sides of the tire. Are there full length fenders for a hybrid with tires that wide? I figure changing the rear fender will be cheaper than buying new quality tires.
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Old 01-28-13, 01:19 PM   #2
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I would think that SKS chromoplastic P50's would work, for tires up to 700x45.

http://www.sks-germany.com/?l=en&a=p...CHROMOPLASTICS
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Old 01-28-13, 01:30 PM   #3
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where on the fenders is it rubbing?

my Blackburn Cloudburst full fenders that are 45mm wide, a lot of people seem to complain they rub wider tire sizes, but if you bend the stay supports out a bit, and bend the ends of the stays back in by the same amount, they will clear a much wider tire.

btw, 80PSI is way too much pressure for a 40mm tire, unless you A) weigh like 300 lbs, and B) have 90% of the weight on the rear tire.

Ideally, you want to measure how much weight is on the front and the rear wheel when you're sitting on the bike at your normal riding position. one way to do this is to put it on two bathroom scales, next to a doorframe or something you can balance against, and have a friend read the weights. with a 40mm tire, you'd be about 5psi below the line for 37mm shown here, http://www.bikequarterly.com/images/TireDrop.pdf (bottom of page 2)/ if you have 150 lbs on the bakc wheel, you'd want 55-60psi
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Old 01-28-13, 03:08 PM   #4
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Old 01-28-13, 03:15 PM   #5
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I would think that SKS chromoplastic P50's would work, for tires up to 700x45.

http://www.sks-germany.com/?l=en&a=p...CHROMOPLASTICS
Agreed. I have P45s on my hybrid with 35 mm tires. I would think the P50s would work fine with 40 mm tires.
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Old 01-28-13, 03:16 PM   #6
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I use aluminum fenders I get from Velo-Orange. They have 52mm aluminum fenders for 700c, but they seem to be out of stock at the moment.

http://store.velo-orange.com/index.p...ender_width=69
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Old 01-28-13, 03:29 PM   #7
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52mm wide fenders might be tough to fit in a lot of frames. I'd measure at the forks and seat stays...

alloy fenders are fragile, they dent easily. the ones I'm using have an alloy 'liner' but are some sort of tough plastic on the outside, so they don't dent on minor impacts.
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Old 01-28-13, 05:02 PM   #8
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btw, 80PSI is way too much pressure for a 40mm tire, unless you A) weigh like 300 lbs, and B) have 90% of the weight on the rear tire.
Or have front suspension to soak up the bumps. My GF Montare rocked with 42mm Conti's @85psi.

BTW,those tire charts should never be considered gospel. They always talk like all tires are the same. World of difference between cruiser/MTB tires and performance tires. I always tell the people at my clinic to keep the pressure in the mid range of what's on the sidewall,because in the real world the majority of riders do not check their tires as often as they should(if I had a nickle for every tire I've pumped that way way low,I'd have a Ti framed cargo bike!) and running low pressures just means they're going to eventually pinch flat.

For the OP:Civia fenders all over eBay that will take 40mm. I've checked 40mm knobbies under mine.
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Old 01-28-13, 05:41 PM   #9
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52mm wide fenders might be tough to fit in a lot of frames. I'd measure at the forks and seat stays...

alloy fenders are fragile, they dent easily. the ones I'm using have an alloy 'liner' but are some sort of tough plastic on the outside, so they don't dent on minor impacts.
I have been using aluminum fenders on seveal bikes for a number of years without incident. Perhaps I am just lucky.
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Old 01-28-13, 06:13 PM   #10
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Originally Posted by pierce View Post
where on the fenders is it rubbing?

btw, 80PSI is way too much pressure for a 40mm tire, unless you A) weigh like 300 lbs, and B) have 90% of the weight on the rear tire.

With a 40mm tire, you'd be about 5psi below the line for 37mm shown here, http://www.bikequarterly.com/images/TireDrop.pdf (bottom of page 2)/ if you have 150 lbs on the bakc wheel, you'd want 55-60psi
The tire rubs the fender near the upper end of the seat stays. I've put an email in to my LBS to see if they have anything. Ordering SKS from the US would be cost prohibitive. I'll likely have to go with cheap all steel fenders, IF I can find them to fit a 700c wheel. Most utilitarian bikes here in Taiwan have 26" wheels.

The markings on the tire say max 85 psi. I have them pumped to 80. On my last couple of rides they were at about 60 and the rear felt and looked a little mushy, especially when hitting cracks and bumps in the pavement. At 80 they feel great. These are road/commuting tires. I imagine MTB tires would run lower pressures.
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Old 01-28-13, 08:23 PM   #11
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The tire rubs the fender near the upper end of the seat stays. I've put an email in to my LBS to see if they have anything. Ordering SKS from the US would be cost prohibitive. I'll likely have to go with cheap all steel fenders, IF I can find them to fit a 700c wheel. Most utilitarian bikes here in Taiwan have 26" wheels.

The markings on the tire say max 85 psi. I have them pumped to 80. On my last couple of rides they were at about 60 and the rear felt and looked a little mushy, especially when hitting cracks and bumps in the pavement. At 80 they feel great. These are road/commuting tires. I imagine MTB tires would run lower pressures.
I ride 700x37c Conti Sport Contact and Vittoria Randonneur Hyper tires. I am a 275 lb. clyde and ride with 68 to 70 psi rear and 62 to 65 front. This is on my Schwalbe electronic gage that doens't include 15 psi for atmospheric, so it is 85 psi rear on my floor pump.
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Old 01-28-13, 08:38 PM   #12
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ALL gauges are relative to atmospheric pressure.

if your floor pump is reading 85 when your other gauge is 70, then the tire pump's gauge is off by 15psi.
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Old 01-29-13, 07:27 PM   #13
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I've actually solved the fender problem for now, although they still aren't quite as wide as I would like. I noticed a small spacer, about 1/4" tall, where the fender screws to the seatstay crossbar. By removing the spacer the fender was raised allowing it to clear the rear tire. Happy for now.
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