So lame- tires don't fit the frame.
03-15-20, 12:27 PM
#1
Sunshine
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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.
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.
Last edited by mstateglfr; 03-15-20 at 12:56 PM.
03-15-20, 01:05 PM
#2
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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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03-15-20, 01:19 PM
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Looks like a candidate for 650B conversion.
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03-15-20, 01:57 PM
#5
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All the more reason that it's odd I would just assume they would fit.
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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03-15-20, 02:59 PM
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650b ftw.
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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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03-15-20, 04:08 PM
#9
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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...
There's a bit more room in the rear, so maybe next time 25s in front, and 28 rear...
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.
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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03-15-20, 05:27 PM
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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.
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.
03-15-20, 06:03 PM
#12
Sunshine
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03-15-20, 06:29 PM
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03-15-20, 06:56 PM
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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.
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?
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.
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..$
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..$
03-15-20, 07:28 PM
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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.
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.
03-15-20, 07:52 PM
#19
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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.
03-15-20, 07:53 PM
#20
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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.
It would be neat to try out though.
03-15-20, 07:58 PM
#21
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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.
03-15-20, 08:03 PM
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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.
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.
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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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.
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.
Last edited by bwilli88; 03-15-20 at 10:44 PM.
03-15-20, 10:44 PM
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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.