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Discussion Starter · #1 ·
What's the best tire pressure for a combined rider and bike weight of a bit over 300 lbs.
Tire size: 27 x 1 1/4"
Rims: steel, 36 spoke.

Road Conditions: New York City. Road conditions vary widely, but often involve very rough streets with lots of potholes, and there are small pieces of broken glass everywhere.

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- I was using "plain, cheap" 90 psi Kenda tires at about 70-80 psi but flatted them at least once a week or every 20 miles, whichever came first.

- I tried adding a Mr. Tuffy and upping the pressure on the Kendas to 90 psi, but they started blowing off the rim with the tubes blowing out with a sound like gunfire, even when I wasn't on the bike, so that didn't seem to work.

- I got a Bontrager Race Lite Hardcase (anti-flat) tire and I'm loving it so far. Not a single flat in a month. And it's rated to 100 psi. It was real hard to get on the rim so I suppose it won't blow off so easily like the Kendas.

Some of the other anti-flat tires like Armadillos and Marathons can go to even higher pressures than the Bontrager. I was wondering if the higher pressure would be an advantage for someone my weight.
 

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I started biking at 280 and my bike is your standard aluminum 20lb bike. I ride at 100psi and haven't had a flat yet at that pressure. About 500 miles on the bike.

Tires: Hutchinson Flash 700 x 23 C
Tube is a Giant 23c.

I'll be going with a 25c once I run these tires down though.
 

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many old steel 27" rins did not have a bead hook to hold the tire on the rim. many tires designed for hook bead rims will blow off non-hook bead rims very easily.
 

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Discussion Starter · #4 · (Edited)
Reynolds531 said:
many old steel 27" rins did not have a bead hook to hold the tire on the rim. many tires designed for hook bead rims will blow off non-hook bead rims very easily.
Hi. Thanks for that tip. I don't think my rims have a "hook." I wasn't aware some rims had that. Doing a little searching on the web, I see some rims have a "bump" around the edge where the bead of the tire contacts it. I guess that's the hook. I"m pretty sure none of my rims have that and they're straight walled.

The rims I'm using now are Araya 27 x 1 1/4 - 1 3/8 Made In Japan. I borrowed them from an old Schwinn 10 speed while I am replacing the broken axles on the rims that came off my Peugeot.

The Peugeot wheels are a DEA Superchrome Made In France (no size specified) for the front, and a Rigida Chromage SUPERCHROMIX 27 x 1 1/4 (HP) Made In France on the rear. If these are the original wheels, that would make them from the late 70s.

The only rim that doesn't have a tire on it at the moment is the DEA and it doesn't have any visible hook.

I like steel wheels for two reasons. One, I figure they're probably stronger than aluminum, and I figure I can use all the wheel strength I can get; and two, they are less likely to attract thieves--an important consideration since I regularly leave my bike locked up outdoors all over NYC.
 

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Discussion Starter · #5 ·
hxcadam said:
I started biking at 280 and my bike is your standard aluminum 20lb bike. I ride at 100psi and haven't had a flat yet at that pressure.

Tires: Hutchinson Flash 700 x 23 C
I'll be going with a 25c once I run these tires down though.
Hi hx,
I'm about 280 also with clothes on, but my old Peugeot is closer to 30 lbs bare and closer to 40 lbs outfitted with all the stuff I have on it to use it as a commuter/errand bike. And when I get panniers on it which are coming, it will occasionally go higher depending on what I"m carrying.

I'm kind of surprised your getting by on 23mm tires and considering going to only 25. I guess 1 1/4s like I have are equal to about 28s and my gut feeling is they're too thin for what I'm subjecting them to. If I wasn't dealing with all the potholes though, it would be different. I expect to drop quite a bit of body weight as I continue to ride which will undoubtedly relieve a lot of stress off the wheels and tires. I just want to get through this initial period. I'm tired of getting flats, although I'm getting better and faster and fixing them. Lol.
 

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My initial thought was that you may have some old rim tape on your wheels, so the spoke could be slightly rubbing the tube. If you've had good success with the Bonti tires, keep using them. But, next time you have to take off your tire, just make sure that all the spoke 'holes' are covered!

Most importantly, keep riding!
 

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TomBrooklyn said:
Hi hx,
I'm about 280 also with clothes on, but my old Peugeot is closer to 30 lbs bare and closer to 40 lbs outfitted with all the stuff I have on it to use it as a commuter/errand bike. And when I get panniers on it which are coming, it will occasionally go higher depending on what I"m carrying.

I'm kind of surprised your getting by on 23mm tires and considering going to only 25. I guess 1 1/4s like I have are equal to about 28s and my gut feeling is they're too thin for what I'm subjecting them to. If I wasn't dealing with all the potholes though, it would be different. I expect to drop quite a bit of body weight as I continue to ride which will undoubtedly relieve a lot of stress off the wheels and tires. I just want to get through this initial period. I'm tired of getting flats, although I'm getting better and faster and fixing them. Lol.
I'd recommend at least 25C. I weigh a great deal less than you and I ride 25s.
 

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I'm a hair under 300lbs myself. I have been riding my C-dale for over a year now. I gained weight over last winter by not riding and I'm not gonna do that again. The stock Shimano rs-10s have been great. I pumped them to 120 psi before each ride. I have never had a flat. I live in the DC area and encounter pavements of all types.

The only issue I had with those wheels was when I crashed while riding in DC. I was riding down a hill on a major route and some idiot on a throw-away bike walked in front of me without looking and going on a red light. After 400 miles of riding the rear wheel went out of true. When I went to get it fixed my LBS recommended Mavic Aksium's since they have wider spokes. I love them and feel more confident riding them. i still keep the tires inflated to 120psi.
 

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At 300 lbs, I'd recommend going to at least 28mm tires. Some ppl in that position would probably even do 32s, if they'd fit the bike.

I remember riding 23s when I was 'only' 215, and I'd pinch-flat lots of times. It also wasn't great from a comfort standpoint or rim protection/helping the wheels hold up under my weight.

I've long since gone to 25s and 28s, never looked back.
.
 

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TomBrooklyn said:
Hi hx,
I'm about 280 also with clothes on, but my old Peugeot is closer to 30 lbs bare and closer to 40 lbs outfitted with all the stuff I have on it to use it as a commuter/errand bike. And when I get panniers on it which are coming, it will occasionally go higher depending on what I"m carrying.

I'm kind of surprised your getting by on 23mm tires and considering going to only 25. I guess 1 1/4s like I have are equal to about 28s and my gut feeling is they're too thin for what I'm subjecting them to. If I wasn't dealing with all the potholes though, it would be different. I expect to drop quite a bit of body weight as I continue to ride which will undoubtedly relieve a lot of stress off the wheels and tires. I just want to get through this initial period. I'm tired of getting flats, although I'm getting better and faster and fixing them. Lol.
I don't do crazy long rides though either. Normally 15miles. Sometimes stretch to 20. I'm down to 245 now though since May. The only flat I had was my first day riding didn't check the pressure that the bike shop set it to which was apparently only 60psi. Got about 2 miles before I pinched it. Haha learned my lesson now I check before every ride and make sure I'm at 100.
 
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