Is this bad? 28mm tire tight squeeze

[zmalwo]

http://i1192.photobucket.com/albums/aa334/brucephoton/20190109_104916_zpsgkp46hn5.jpg (http://s1192.photobucket.com/user/brucephoton/media/20190109_104916_zpsgkp46hn5.jpg.html)
http://i1192.photobucket.com/albums/aa334/brucephoton/20190109_104930_zpsjdi6mqis.jpg (http://s1192.photobucket.com/user/brucephoton/media/20190109_104930_zpsjdi6mqis.jpg.html)
It's a 28mm conti gp 4000s 2 at 95psi, as you can see barely any room left. Can i run it like this?

[biker72]

Don't go through any mud....:)
That's about the same clearance I have on my Lynskey with Conti GP 4000 28's.

[eddief]

I think the under-brake clearance is close but mostly ok. As for the seat tube, maybe foolhardy. For either spot you are risking a rock or chip or something lodging in between. Probably not super dangerous but I have been nearly stopped on a dime by a rock between tire and brakes. And then there's always crap sticking to the tire and making a bunch o rubbing noise until is flicks off the tire.

Too much pressure anyway :).

[Joe Remi]

It's not great, but I'm running that kind of clearance with a GP4000 28 at the brake bridge on my Seven. I figure a rear wheel lockup from stuck debris means skidding to a stop, a risk I'm willing to take but YRMV. I have more room at the fork, which presumeably you do, too. That clearance would be a no go up front.

[loxx0050]

What's the clearance look like at the chainstay area behind the BB area? If that is pretty tight you'll definitely get some rubbing (aka 2mm or less clearance each side). I had that on my bike and wasn't comfortable with it (both rubbing the frame for damage on both that along with the tire). Went with narrower tires the next size down.

[bikinchris]

Wouldn't fly in South Louisiana in winter, but if your roads stay clean, fine.

[rst72]

What's the clearance look like at the chainstay area behind the BB area? If that is pretty tight you'll definitely get some rubbing (aka 2mm or less clearance each side). I had that on my bike and wasn't comfortable with it (both rubbing the frame for damage on both that along with the tire). Went with narrower tires the next size down.

yep. like others have said, you're fine on CLEAN roads with that caliper and ST clearance...but you can't avoid chainstay rub if clearance is as tight as i think it is.

[fogrider]

What wheelset are you using? From the pic, I see 3 spokes close together, looks like the Rolf low spoke wheels (or something like that) with 2 on the drive side with 1 on the non drive side. Have you had good luck with these wheels staying true? On some rough roads and a few potholes, they may go pretty wacky.

Sent from my Moto G (5) Plus using Tapatalk

[m_sasso]

When every bit counts, you might want to check some tire size differences, Aero Coach says the new GP5000 in a 23 mm has a lower casing height then a 23 mm GP 4000, the same could be true of the 28 mm tires. One mm is not a lot but could make the difference.

https://www.aero-coach.co.uk/gp-5000-data

[commonguy001]

Looks like a cento1 air. I ran 25mm gp4000s on mine and it was tight. Saying that I don’t think they looked any tighter than yours does and they measured out at 27mm. I remember the front tire and downtube being real close too.

[charliedid]

Looks too close to me even without good pics. The fact that you are reaching out for consensus makes me believe you think they are too tight. It's been awhile since being up close with one of those bikes but I don't recall 28's fitting.

[saab2000]

Clearance looks tight but OK if you’re not riding wet gravel roads every day.

That brake cable looks awful! Too long and no end cap. Fix this!

[zmalwo]

http://i1192.photobucket.com/albums/aa334/brucephoton/20190109_202112_zpsanumce9s.jpg (http://s1192.photobucket.com/user/brucephoton/media/20190109_202112_zpsanumce9s.jpg.html)
http://i1192.photobucket.com/albums/aa334/brucephoton/20190109_202106_zps8nlpe8ix.jpg (http://s1192.photobucket.com/user/brucephoton/media/20190109_202106_zps8nlpe8ix.jpg.html)

there's about 3mm of clearence on each side so i put some electric tape on where the tire might rub, you guys think this will do the job maybe?

[R3awak3n]

http://i1192.photobucket.com/albums/aa334/brucephoton/20190109_202112_zpsanumce9s.jpg (http://s1192.photobucket.com/user/brucephoton/media/20190109_202112_zpsanumce9s.jpg.html)
http://i1192.photobucket.com/albums/aa334/brucephoton/20190109_202106_zps8nlpe8ix.jpg (http://s1192.photobucket.com/user/brucephoton/media/20190109_202106_zps8nlpe8ix.jpg.html)

there's about 3mm of clearence on each side so i put some electric tape on where the tire might rub, you guys think this will do the job maybe?

I think 3mm is enough but if the tire does rub, that tape will do nothing. It will go within 10 minutes of ridding if the tire constantly rub there.

[charliedid]

I'd stick with 25's if it were mine. Your bike your call, but I think it will rub.

[charliedid]

OP

Have you been riding the 28's?

[weisan]

Do it!

[pobrien]

Is this the bike you plan to tour Japan on?
If so, and if you plan to ride on country roads, you might want more tire gap.

[jtbadge]

I would definitely not ride a carbon bike with that little clearance if you're riding anywhere but smoothly paved, dry roads.

[Peter P.]

I would definitely not ride a carbon bike with that little clearance if you're riding anywhere but smoothly paved, dry roads.

Yet another reason to not ride carbon. :rolleyes:

If you have to ask, then you're concerned. And if you have to put electrical tape at potential contact points, then you're doubly concerned. Get a smaller tire.

[glepore]

I wouldn't do that, fwiw. I get the comfort of 28's, but that's close. The reason I ran pave's on that bike was the comfort level and they were durable for Vittorias.

I had a buddy with a large Uno Air that he traded in for a 10 Air because he could flex it enough to get chainstay rub with 25's on 303's. I never had an issue with the small frame you now have, but I'd be cautious. Carbon doesn't like abrasion.

Those are also wideish rims on there-I know they're 25 external, and believe they're 18 internal.

[93KgBike]

You definitely do not want the tire to hit the stays on a carbon frame. If you are going to use tape, it needs to be teflon tape; gaffers tape is useless there.

[wallymann]

gaffer tape? teflon tape? no way, josé!

i recommend a couple layers of clear 3M mil-spec helicopter tape. granted no tape is perfect, but this stuff is designed to withstand abrasion/erosion well beyond any tape you'd encounter at your local hardware store.

You definitely do not want the tire to hit the stays on a carbon frame. If you are going to use tape, it needs to be teflon tape; gaffers tape is useless there.

[hobbanero]

+1 for dropping your tire pressure. Casing tension on 28s at 95psi is much higher than narrower tires at same pressure, so your comfort goes down and rolling resistance goes up.....lose lose.

Try 80psi....that is where I ride my 28s (measured, not claimed), and at 80kg, I don't pinch them. Many riders go even lower.

[Joxster]

A Conti 25c measures close to 27.6c

[zmalwo]

**************UPDATE*************
It rubs against the chainstay when i pedal out of saddle. the tape that was on there was gone in 10 min like he said. altho i'm not sure if it's because the low spoke tension on those chinese carbon wheels tho because my 25mm gp 4000s ii on my colnago has much tighter clearance but the zonda wheels are very rigid so I didn't have problem of tire rub.

[kaotic28]

I'm not surprised, as much as I'd like to run 28's on my Nago C50 I can (just barely) run 25's on it.

[zmalwo]

OP

Have you been riding the 28's?

First time actually, picked this bike up from Greg right before i left, fitted a 28mm conti 4000s ii and didnt have time for a ride. Now im in another country looking for a smaller tire :mad:
Should have listened.

[charliedid]

Not surprised at all.


Sent from my iPhone using Tapatalk

[philhan89]

go 25s. i have much more clearance and i have been stopped rather abruptly with a stick between tire and fork in the front before. in my opinion its a risk not worth taking.

[pdmtong]

IMHO that is too tight. It's insufficient to caveat ok for clean roads since a road is clean until well, err, it isn't. meaning there is going to be a time where you just don't see the debris that is about to cause you some headache whether thats a wheel rub or a lockup or worse.

it's well documented on this forum that a Conti GP4ks2 is the fattest tire for it's size. Try a vittoria G+ 28

[bironi]

Don't sweat it, ride it.

[lhuerta]

it's well documented on this forum that a Conti GP4ks2 is the fattest tire for it's size. Try a vittoria G+ 28

...and TALLEST profile....which often results in rubbing under brake caliper or bridge.

[charliedid]

OP already posted a couple days ago to this thread that the tires rub and he is sourcing different ones.

[dddd]

It seems to me that this is more of an issue with the frame flexing than of the wheel flexing.
Reason I say this is that flexing spokes will cause the wheel hoop to tend to rotate about an imaginary axis connecting the front and rear dropouts, which would only lead to rubbing up at the brake pads. I've built low-count carbon wheels as requested by big riders while fully expecting this outcome, and which came to pass.

If the driveside chainstay is compressing while the chainstays are flexing laterally, then the clearance at the chainstay(s) will tend to get used up unless the tire is narrow enough for the particular combination of frame, rider and riding style.

The GP5000 tire in 28mm has been reported to be several mm narrower than the "same sized" version of GP4000, should clear up any marginal clearance issues.