How can I tell from the bike frame whether it needs 26 or 28 inch rims (not tires, I made a typo in the title)?
Is there any indication on the frame or can you measure it?
(1 votes)
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In a big box, right? And do you still have to assemble it?
The wheel size in inches is always including tyres. A rim which produces a 28″ wheel with a tire has no diameter of 28″ but 622 mm, which is about 24.4″. If you mount a thick MTB tire on the same rim, you even have a 29″ wheel.
But of course you can measure it.
Put a screwdriver or the like in the downside, so you know where the axis is. And then look where the tubes of the frame are so narrow that the space for the tire becomes narrow. Or even up to the protective sheet if this is still present. The radial distance here between you measures – with a 26″ tire it is roughly 33 cm and with a 28″ tire it is 36 cm.
I do not want to know how much customs the tyres have, but how much customs the frame has. But the problem has already settled, as described above.
Great. You haven’t even read the first sentence.
I said quite clearly why the tyre is not to be ignored. Because it defines the wheel size.
Look for a rim with a diameter of 28″.
Yes. Maybe you should have been more understandable?
You can only determine this with the meter on the front wheel. If only approx. 36 centimetres of space, you only get 26-inch wheels under. For 28 wheels you need about 3 centimeters more.
The problem is that the protective plates are also missing. On the frame are 28 he rims. Since the protective sheet for the 28er rims seems to be too large, I wonder if the frame might have to be fitted with 26 rims and accordingly a smaller protective sheet.
Is there a possibility without a protective sheet (only on the frame) to see if 26 or 28 rims belong to it?
I have measured for the purpose of confirming that the protective plates and thus these dimensions are just below the fork crown or below the crosspiece of the rear struts. With my 28″ racing bike of the 90s, it has only 36cm to below the fork crown, but there is also only a 23mm wide tire.
So at 36cm (up to the fork crown) you will not be able to mount thicker tyres than 23mm on the 28-inch rims. And that even without a protective sheet! I don’t know what’s so hard to understand. I guess you’re braking with disc, so you don’t need to take into consideration a height of rim brake pads?
The problem has now been solved. The protective struts of the rear rear panel were unfavourable, which is why it appeared too large. In the meantime, both the front and the back of the protective sheet (each 28 rims and probably 28er protective sheet) fit. I don’t think I have a 26 frame or a 26 fork. Nevertheless, thanks for the input, motivated me to disassemble everything again and to review it step by step.
Okay, your information doesn’t help me with my problem, but still thank you.
How do you want to know from a distance with the measures I called you?
Okay, I think we’re gonna leave this thing because you obviously misunderstood me.
Can it be that it is a 26 fork on which a 28th wheel rim fits without any problems with protective plate? The problem lies with the rear (!) rim that the protective panel does not fit there. Everything’s right on the front.
This is not so bad for the self, because by changing the tyre sizes at the MTBs there is a lot of good, used 26″ wheel material.
No, if that’s not exactly a very tightly built racing wheel fork, so on the trekking wheel it’s definitely a 26″ fork.
Thank you for your efforts. I just checked on the front wheel. From the hub to the underside of the fork crown it is about 36 cm. That would mean that actually 26 rims fit when it is a wheel from the 90s, but also 28 rims? My framework should also come from the 90s. It’s a City/Trekkingrad.
Strangely, the front protective panel fits the 28s rims and the frame. Only the rear protective sheet is too large. Can it be that there are also 30 protective plates and I have a 30-piece protective plate at the back, which therefore does not fit into the frame and the 28-inch rim?