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So lame- tires don't fit the frame.

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So lame- tires don't fit the frame.

Old 03-15-20, 12:27 PM
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mstateglfr 
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So lame- tires don't fit the frame.

I have no idea why I assumed 32mm tires would fit the '88 Schwinn Premis I've been slowly working on, but I decided to try em out and they arent even close to fitting. The tires hit the brake bridge and fork crown quite substantially. The pics are with both tires only half inflated.
good news is there is plenty of room along the chainstays and bridge.

The plan was to strip the paint and rust, braze on some brake cable guides, then get it powder coated and built with modern 105 and modern cockpit.

No idea why I assumed 32s would fit and no idea why this has me all annoyed(maybe because i have these 32s that arent used for any bikes!).
If 28s fit, then I should continue with the plan, but man that's annoying I didnt even think to check clearance before putting in the work and planning.





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Old 03-15-20, 01:05 PM
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I find that to be common with most Japanese bikes made in the late 80's. My Miyata 312 won't take 28's let alone a fender, for which there's frame attachments. I'm assuming the Premis is also Japanese?
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Old 03-15-20, 01:13 PM
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What about going 650b?
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Old 03-15-20, 01:19 PM
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Looks like a candidate for 650B conversion.
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Old 03-15-20, 01:57 PM
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Originally Posted by clubman View Post
I find that to be common with most Japanese bikes made in the late 80's. My Miyata 312 won't take 28's let alone a fender, for which there's frame attachments. I'm assuming the Premis is also Japanese?
It was made in greenville, ms. But still- yes the trend was for later 80s competition level(mid to upper tier) bikes to have less clearance.
All the more reason that it's odd I would just assume they would fit.
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Old 03-15-20, 02:02 PM
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To me this was a ridiculous trend for which i see no upside. Its why i prefer frames designed for 27s.
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Old 03-15-20, 02:59 PM
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650b ftw.
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Old 03-15-20, 03:36 PM
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Had this issue on an a 89 Allez with 28s so I ended up buying 25s
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Old 03-15-20, 04:08 PM
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I had that problem fitting 700x28s on my '86 Miyata 710. Only 1mm of clearance - maybe...



There's a bit more room in the rear, so maybe next time 25s in front, and 28 rear...
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Old 03-15-20, 05:25 PM
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Grand Prix 4000 is known to inflate bigger than stated, while other brands/models are just the opposite.

These tires won't work, but now to find out what will!

I prefer 25's myself.
Only my old carbon Epic and my Rigi seem to have any problem mounting GP4000 25mm.
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Old 03-15-20, 05:27 PM
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Originally Posted by mstateglfr View Post
I have no idea why I assumed 32mm tires would fit the '88 Schwinn Premis I've been slowly working on, but I decided to try em out and they arent even close to fitting. The tires hit the brake bridge and fork crown quite substantially. The pics are with both tires only half inflated.
good news is there is plenty of room along the chainstays and bridge.

The plan was to strip the paint and rust, braze on some brake cable guides, then get it powder coated and built with modern 105 and modern cockpit.

No idea why I assumed 32s would fit and no idea why this has me all annoyed(maybe because i have these 32s that arent used for any bikes!).
If 28s fit, then I should continue with the plan, but man that's annoying I didnt even think to check clearance before putting in the work and planning.




What kind of tires? I may have some 28s to swap out for these.
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Old 03-15-20, 06:03 PM
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Originally Posted by bikemig View Post
What kind of tires? I may have some 28s to swap out for these.
conti 4 season that are new.
Later tonight I'm going to mount some 25mm gp4k tires from another bike which run a couple mm wider than that to see how they fit.
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Old 03-15-20, 06:29 PM
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Originally Posted by mstateglfr View Post
conti 4 season that are new.
Later tonight I'm going to mount some 25mm gp4k tires from another bike which run a couple mm wider than that to see how they fit.
I'll send a PM; I have some tires you may be interested in.
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Old 03-15-20, 06:56 PM
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Originally Posted by Cougrrcj View Post
I had that problem fitting 700x28s on my '86 Miyata 710. Only 1mm of clearance - maybe...



There's a bit more room in the rear, so maybe next time 25s in front, and 28 rear...
I have an ‘85 and an ‘86 710. The ‘85 has more room and dia comp 500 mid reach brake calipers. The ‘86 has less room and short reach Dia Comp 400 brake calipers. Good news is your ‘86 has the fatter seat stays and Chromo forks while the ‘85 has Mangalite forks.

That year really marks a change between a more traditional “sporting” bike and a “racing” bike. I don’t know why they kept the eyelets on the ‘86 model, I don’t think you could fit fenders with anything bigger than a 23mm (possibly (but doubtfully) a 25mm) tire.
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Old 03-15-20, 07:10 PM
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Would it be worth getting a little wild, grinding that bit of excess under the crown and doing a bit of braze work on the bridge?
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Old 03-15-20, 07:16 PM
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A Premis, in stock form can't run a tire bigger than 25c, maybe some small 28's can fit, but it would be VERY VERY close, cigarette paper clearance.
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Old 03-15-20, 07:23 PM
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The 1980's : splash tape, clearance for 23's MAX.

You could take a halfround file to the crown, find a builder to move the bridge up.
The frame is naked. $$
650b, good, but brakes and wheels....$$$
Smaller tires..$
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Old 03-15-20, 07:28 PM
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Originally Posted by repechage View Post
The 1980's : splash tape, clearance for 23's MAX.
It will fit 25c tires reasonably, I just built up the exact same frame.


I would like to shift my asphalt bikes to 28c tires, but I'm plenty happy on 25c tires too, but the Premis will forever be a 25c bike. I do have the tools and skill to move the brake bridge up, but I'm fine with it as it sits.
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Old 03-15-20, 07:52 PM
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Originally Posted by GrainBrain View Post
Would it be worth getting a little wild, grinding that bit of excess under the crown and doing a bit of braze work on the bridge?
Grinding the fork crown is fine. Removing the current bridge and installing a new bridge is more than I think I want to do...though I am already set to braze on some cable guides.
What's funny is that this really isnt some impressive frame. The Tenax tubing is ok but nothing incredible, and the tube joining all around has an obvious focus of being as quick and cost effective as it gets.
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Old 03-15-20, 07:53 PM
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Originally Posted by CO_Hoya View Post
What about going 650b?
Originally Posted by JohnDThompson View Post
Looks like a candidate for 650B conversion.
Originally Posted by nlerner View Post
650b ftw.
I dont have 650 wheels and while it would be neat to try, this isnt the time or frame for that.
It would be neat to try out though.
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Old 03-15-20, 07:58 PM
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Originally Posted by jackbombay View Post
A Premis, in stock form can't run a tire bigger than 25c, maybe some small 28's can fit, but it would be VERY VERY close, cigarette paper clearance.
Originally Posted by jackbombay View Post
It will fit 25c tires reasonably, I just built up the exact same frame.
I would like to shift my asphalt bikes to 28c tires, but I'm plenty happy on 25c tires too, but the Premis will forever be a 25c bike.
I fit some 25mm GP4k tires tonight that measure out to 27mm and they fit fine with enough clearance that I would be comfortable.
Then I tried some 28mm GP4k tires that measure out to 30.5mm and they are really razor edge thin on fitting.

Bikemig and I will swap some tires and I'll try out some Panaracers that I've read are a true 28mm and that would then most likely be OK.

But at worst, I'll toss the 27mm true size GP4k tires on and call it a day.


Always funny when something throws you for a loop even though you know about it well in advance.
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Old 03-15-20, 08:03 PM
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Originally Posted by mstateglfr View Post
I fit some 25mm GP4k tires tonight that measure out to 27mm and they fit fine with enough clearance that I would be comfortable.
Then I tried some 28mm GP4k tires that measure out to 30.5mm and they are really razor edge thin on fitting.

Bikemig and I will swap some tires and I'll try out some Panaracers that I've read are a true 28mm and that would then most likely be OK.

But at worst, I'll toss the 27mm true size GP4k tires on and call it a day.


Always funny when something throws you for a loop even though you know about it well in advance.
As I had several 25c tires around I had planned on using them for my Premis build, then when I put the wheels in the bike I chuckled as anything bigger wouldn't fit with enough clearance for me to feel comfortable anyway!

While frames that can't take a tire bigger than 25c are absurd, I'm glad I have one in my fleet, it was a trend in cycling that in retrospect made no sense, but is still a vaguely interesting footnote.
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Old 03-15-20, 08:38 PM
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Originally Posted by dddd View Post
Grand Prix 4000 is known to inflate bigger than stated, while other brands/models are just the opposite.

These tires won't work, but now to find out what will!

I prefer 25's myself.
Only my old carbon Epic and my Rigi seem to have any problem mounting GP4000 25mm.
Yes, my GP4000's 25's measure 28mm.
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Old 03-15-20, 10:39 PM
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Just me but I would take a half round file to the fork and a BFH to the brake bridge. If you are doing brazing that brake bridge is an easy job while in a bare frame state.
To dimple some chain stays I took a large cast iron cylinder about 2.5" in diameter and hammered it between the stays, flattened them enough I could fit the tires I wanted.
Regards the fork and brake bridge, you might also have to file the brake caliper a bit if you go the file direction and or BFH.

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Old 03-15-20, 10:44 PM
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Originally Posted by bwilli88 View Post
Just me but I would take a half round file to the fork and a BFH to the brake bridge.
File to the fork crown? Sure I'd start with a grinder and then make it nice and symmetrical with a file.

The brake bridge + BFH? No way.

To be clear, I LOVE problems I can solve with a hammer, and I have a large assortment of hammers to solve all sorts of problems that may unfortunately cross my path, but, as the OP has the capacity to braze, he should move the brake bridge properly, IMO.
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