Tyre Pressures

nick7 said:
Saw a couple of Buells yesterday at the Bike Shed show...you may recall they use a single rim mounted disc. Looks funky...is there an advantage to that design? As far as I know nobody else uses it?
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If you want to stop a spinning wheel, you grab it at the outside edge rather than somewhere close to the axle. In the same way, a large diameter disk will give better stopping power than a smaller one. Having a disk bolted to the inside of the rim is about as large a diameter as you can fit within the wheel.

The downside of a brake disk bolted to the rim is that it's easily distorted. If the rim is knocked out of line by hitting a pothole or some other irregularity, it'll likely affect the alignment of the disk. A fraction of a mm runout in a brake disk will affect braking performance and will be felt through the brake lever.

Hub mounted disks are much less likely to be knocked out of line.
 
Thought I was going to end up with my third puncture in three weeks yesterday. Hit a couple of effing great potholes on the BM, the first around 60mph, the second slightly slower, but still gave me the heart in the mouth moment. Fortunately the wheels and tyres seem to have survived as I’m heading back to the ferry shortly And can do without a breakdown.
 
you, as a manx resident, are taking the ferry in IOMTT practice week? now I know that you dont need certifying to be called insane.
CLEM
 
CLEMTOG said:
you, as a manx resident, are taking the ferry in IOMTT practice week? now I know that you dont need certifying to be called insane.
CLEM
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Well it’s a very, very long time since I last experienced travelling from Liverpool with a bike during TT (1982 I think) so I thought, let’s see how much it’s changed. Not sure I have noticed much difference. 🤔
 
Andy J said:
Thought I was going to end up with my third puncture in three weeks yesterday. Hit a couple of effing great potholes on the BM, the first around 60mph, the second slightly slower, but still gave me the heart in the mouth moment. Fortunately the wheels and tyres seem to have survived as I’m heading back to the ferry shortly And can do without a breakdown.
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Although no puncture, I noted this morning a rubbing sound from the rear of the bike as i wheeled it out of the garage. A closer inspection identified the carbon rear hugger was now tight against one side of the tyre. It appears the impact with the pot holes was sufficient to compress the suspension to the extent that the upper wheel arch coverings collided with the rear hugger and bent the two metal brackets securing it to the single sided swing arm. This impact was probably made easier by the fact I run the bike on the softest spring setting. I may have to consider bumping it up a notch as it looks as though the hugger may have been in contact more than once.
In theory it should have been a simple job to remove the hugger for the journey home, but typically it was not. The two fixings, of different sizes, have the less common star heads, so I only had the option of the flimsy tools supplied with the bike. The larger of the two was moveable with the ‘s’ shaped key and a ring spanner for leverage, but the smaller - but longer fixing into the drive chain case - relied on a screwdriver style tool. Even with a liberal dose of penetrating oil and a wrench gripping the ‘driver’ it wasn’t budging, and I was worried about damaging the head, so abandoned my attempt and rode to the local BMW dealer. The application of a meatier star socket and ratchet did the trick, but what a PITA. I shall definitely have to reconsider the contents of the tool wrap carried under the seat for future longer journeys.
 
F**k, f**k, f**k, I discovered the third puncture today when I took my MPV into Douglas. Front near side tyre has a gash in the sidewall and has been slowly deflating whilst I was away in UK. And of course it’s got plenty of tread life left, but now just a waste disposal problem. 🤬
 
Andy J said:
F**k, f**k, f**k, I discovered the third puncture today when I took my MPV into Douglas. Front near side tyre has a gash in the sidewall and has been slowly deflating whilst I was away in UK. And of course it’s got plenty of tread life left, but now just a waste disposal problem. 🤬
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I know MILF but what is MPV? How do you get it, him or her, into Douglas?
You've got me all excited now.
Paul
 
Andy J said:
It appears the impact with the pot holes was sufficient to compress the suspension to the extent that the upper wheel arch coverings collided with the rear hugger and bent the two metal brackets securing it to the single sided swing arm.
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Is the hugger an original BMW fitting? If so, then it seems to be poor design if the bike can mangle itself during normal use.
 
Dellortoman said:
Is the hugger an original BMW fitting? If so, then it seems to be poor design if the bike can mangle itself during normal use.
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No, it’s a supposedly quality, German made and supplied aftermarket item, but I’m still surprised it managed to hit. I think I need to look a bit closer at the wheel travel as the hugger was a tight fit to start with, but it begs the question, if the hugger wasn’t there would the tyre have hit the under tray.
 
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