15
votes
Accepted
Front tire & downtube clearance - extremely dangerous?
Yes, extremely dangerous, as evidenced by your falling over the handlebars
It's evident from the photograph you linked, that the fork is pushed backwards, bringing the wheel much too close to the ...
- 13k
12
votes
Front tire & downtube clearance - extremely dangerous?
Based on the photo - the fork is utterly dead and shouldn't be ridden.
The frame may have stresses/subtle bends about 2-3" / 50-75mm aft of the headtube on the top and down tubes, and should be ...
- 131k
9
votes
How does the new Canyon Endurace rim version support 33mm tyres with R7000 brakes?
I talked to Canyon's support and they have clarified that apparently it's an error.
- 465
8
votes
Accepted
Does low tire pressure affect safe, minimum tire clearance?
By "clearance" I assume you mean distance between the tire and frame members.
If you run a tire at low pressure, that only affects the tire's shape where it contacts the ground. It won't ...
- 30.5k
8
votes
Accepted
What's to stop someone from installing the largest tyre that'll fit?
Nothing stops. IF the tyre indeed fits (not just one paper through some uncertain number like 28 mm or 2.4", but by actual trying the clearance), there is no reason not to use it if the rider has ...
- 17.4k
8
votes
Rear wheel centered at seatstays but offset at chanstays
On many bikes the right chainstay is shaped to allow bigger cogs on a proper chainline. I'd hazard a guess it's closer to the right chainstay than the left. Here's an old but extreme example (Merlin ...
- 62.5k
7
votes
Accepted
Rear wheel centered at seatstays but offset at chanstays
I have read through the comments on the other answer and want to clarify that flipping the wheel eliminates the possibility that the wheel is incorrectly dished.
Therefore, the only posibility is that ...
- 15.8k
6
votes
Typical and minimum ground-pedal clearance
Clearance is a function of the bike's geometry, crank length, bottom-bracket width, tire width, and pedal design. So it's difficult to talk about a single number that takes all these variables into ...
- 30.5k
5
votes
Does low tire pressure affect safe, minimum tire clearance?
For the most part it doesn't matter because at the spots where the tire is passing close to the frame/fork, it's unloaded by anything but air pressure and will be dimensionally very close regardless ...
- 88.2k
5
votes
Chain touches frame after re-installing crank
Taper bores can sometimes become enlarged with repeated installations, which affects clearance some none-zero amount, but this looks too extreme to be caused by that. It looks like it's probably an ...
- 88.2k
5
votes
Accepted
Can 700x28c wheels and tires fit in my MTB frame?
An old MTB will have used 26" wheels (559mm rims), you want to put 700c (662mm) rims on it with smaller tires.
We can work out wheel approximate diameters. Assuming tire height above the rim is ...
- 75.9k
4
votes
Front tire & downtube clearance - extremely dangerous?
Sure the hub and skewer on the front wheel is not really messed up? The only other place there would be that much flex is the forks. In which case if the bike is riding like that now, I would pass on ...
- 2,555
3
votes
What's to stop someone from installing the largest tyre that'll fit?
There are a few factors.
There is a possibility of tyres being too wide for the rim (Sheldon has a table) - but perhaps you include that in "fit".
*On the other hand, tyres come up ...
- 62.5k
3
votes
What's to stop someone from installing the largest tyre that'll fit?
Whether a tyre will 'fit' or not is somewhat subjective.
And the same tyre may fit differently on the same frame depending on what rims it is installed on.
A couple of examples:
A road bike might be ...
- 18.5k
3
votes
How does front derailleur limit the tire width?
The FD limits the tyre width by moving the cage to the left, to access smaller chainrings.
If you could move the FD, right crank/spider/chainring to the right then you'd have more room for wider tyres,...
- 131k
3
votes
Will 27 x 1 1/4” tires be too wide for an old bike that came with 27 x 1 1/8” tires?
In lieu of more information about the bike, the best answer is probably not, but maybe. You can find some examples of bikes that came with 27x1-1/8" that also max out at that size, but they are ...
- 88.2k
3
votes
Front tire & downtube clearance - extremely dangerous?
This should not happen with a normally setup bike. Possible mis-maintenance I'd speculate could have been at play:
Bent or busted fork or frame
Replaced fork with wrong size replacement.
Badly ...
- 12.2k
2
votes
Front tire & downtube clearance - extremely dangerous?
Image
Commentary
No question the steerer tube and blades are not in the intended alignment. Your fork ends up deflected back toward frame. I'm not sure a headset problem could create that look ...
- 11.3k
1
vote
Can 700x28c wheels and tires fit in my MTB frame?
@GregoryLeo another side-thought is gearing changes.
Some assumptions - the bike is a 48/38/28 triple, with an 11-32 cassette (number of gears is irrelevant here) and I've assumed a 559-54 tyre, so ~...
- 131k
1
vote
Can 700x28c wheels and tires fit in my MTB frame?
is it a MTB frame for a 29" wheel originally? then "probably" But if its a smaller wheel size then your chance of success will drop.
You also need to check the OLD of your frame vs ...
- 131k
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