Milton Keynes

Hi all,

I'm looking at buying an old Trek 1100. I haven't seen the bike in person yet, will be taking a look at it this weekend. The seller says it's got 700x23 tires on it now. I personally prefer 28's, but I don't know if there will be enough frame clearance to mount them on this bike. Does anyone know, or is there a site that gives this information? I'm really hoping the 28's will fit as I have a couple of new ones which came off another bike.

Mulberry20

Highly doubt it. You might even have trouble with 25's depending on the inner width of the wheels and the brand of 25 you try. Some are sized very large and some true.

The 25's I have found most true are Veloflex Corsa Evo (great tire) and Panaracer Race A's (another great tire).

But 28's I doubt no matter which brand you try.

ClydeClydeson

I wouldn't bet on it, but it depends on which tire and the dimensions of the rim.

I have an early 90s road bike on which I successfully installed 28mm knobby cx tires, but had a set of 28mm road tires that would not fit.

Some models of tires are made in 700x26mm, so this intermediate size might work if 28s do not.

burnthesheep

No.

Brother in law let me use his 1100 for a year learning to ride way back. I put some 25mm Conti on it. That fit. Barely. No way 28mm will fit. The 25mm were so close, if I had to do it again I'd only run the 23's on it. The gap to the brake caliper was just still too close.

If you had to try a 25, go with one that stays true size inflated. Not a tire known to balloon out once at pressure.

Milton Keynes

OK thanks for the info. Looks like I'll probably have to stick with the 23's.

drewtk

Also keep in mind that a tire might say "25mm" but the actual measured width will vary, in part based on how wide the rim is. My Continental GP4000's on wide rims measure 30 mm wide, actual width measured with a caliper.

fietsbob

+ 1 , I mounted a '28', measured the width with it inflated on the rim, & it was 25 mm..

70sSanO

1991, 92, 93 Trek Catalogs spec 700x25c tires on the 1100. Depending on the actual tire, you might get a 28c to work.

If you already use 28c tires, measure the height and width. Check the rim width of the rim(s) you are using with the 28c. Measure the available clearance on the 1100 with the 23c tires to see how close it will be. Original Trek 1100 used a Matrix CD2, Matrix Titan II, or Matrix Titan Tech depending on year. Probably all around 13mm, but you can research. Numbers mean more than opinions.

John

Milton Keynes

Well, I guess I'll see if & when I buy the bike. I guess the best way is to put one of the 28's on one of the rims and see if it'll actually work. If the 28's don't fit, 25's would make me happy. But I'd really like to use these 28's since they're virtually new. If they won't work I guess I'll put them up on the local bicycle buy/sell/trade group or keep them for a future n+1.

Paul Barnard

Not everyone's 28 is a true 28 and the rims has a lot to do with it. My GP 4000's are closer to 32 on the rims they are on.

Milton Keynes

That's encouraging. Like I said, if I can't fit the 28's to that frame, I'll be happy with 25's. If that's what they were manufactured with, then they ought to fit. Hopefully there's another 3mm clearance. But I'll try mounting the 28's on the bike and seeing if by chance they'll fit. I suppose it does depend on the rims as well as the tires.

For the record, this is what tires I have: https://www.amazon.com/Continental-C...9162214&sr=8-9

Mulberry20

what is the internal rim size?

fietsbob

waiting until its there & measuring, not considered, or, is the fit capability yes /no going to make you buy or not ?

Milton Keynes

I'm pretty much planning on buying the bike, provided it's in sound mechanical condition. I was just curious as to whether or not I'd be able to use these tires I have off my old bike since they're fairly new. I don't think I put more than 20 miles on them.

burnthesheep

This is shady, but I have done it fine to gain a couple mm vertical.

I taped a cut piece of rectangular shaped zip tie into the dropouts. Not enough to interfere with lawyer tabs or anything.

It worked. It was a one time thing that allowed me to ride and it gave the space I needed.

Chide me, but avoided missing a ride next day!

dmark 

I have run 25mm Michelin on my Trek 1400 if that is relevant.

dedhed

I ran 25's on the '88 1000 I had

Milton Keynes

Just for the record, yes, the Continental 700x28's I have will fit on my Trek... just barely. There's not a lot of clearance left, but they do fit. Front tire fits fine with plenty of clearance. Rear tire comes within a few mm of the rear brake caliper. I will ride these tires until they wear out and then get 25's in the future.

70sSanO

If they are within a “few” mm, just keep riding the 28’s if you like them. And as already noted, another mfg might be slightly smaller.

John