Transport bike in the rain

[Thumper]

I regularly hit 100KMPH on my MTB!

Does this mean I should stop riding when it rains?

[Slowbee]

he he he he...same old same old...

 

Been away for a month and NOTHING has changed....

 

you gotta loooove The Hub!!!

oi, crazy frog, you doing the charity ride?

[Slowbee]

So much of handbag slinging so early - looks like its PMS-Friday on thehub...

 

you and the mrs going to join the charity ride ? expect to see the mtn bikes

[Captain Fastbastard Mayhem]

Love the dedication in your experiment!

 

Nothing beats personal experience!

[facepalm]

Iam sure this will keep the water out. Dont knick it when putting it on. Remember to roll it all the way down

[davetapson]

Lot of opinions again, but no fact. My pressure washer (and yes I use it to clean my bike) delivers water at a pressure of 110 Bar.

 

The equation to get water discharge velocity:

 

V = Sqrt (2 x g x h), where V is velocity, g is the gravitational constant and h is the water "head".

 

To convert "head" to pressure: P = rho x g x h; thus h = P / (rho x g), leaving V = Sqrt( 2 x (P / rho))

 

This equates, without losses to 148 m/s. With a small round orifice like the head of a pressure jet, the loss factor is roughly 0.6.

 

Thus the expected water velocity is 60% of 148 = 89 m/s

 

89 m/s = 320 km/h

 

So no, at 1/3 of the velocity of a pressure hose, I do not think the water ingress will be a big deal.

 

I believe that if it cant hurt you it cant hurt your bike. and very honestly, i did the experiment by sitting on a bakkie in the rain before, water at 100km/h does not hurt on your body (maybe a little on your face)

 

You got to love engineers.

Gold star for this man.

 

Which reminds me of a chirp from my boet, who's an engineer, when some activist type chick asked him what the engineering dept were doing about the HIV/AIDS epidemic: 'We're engineers' he said, 'We don't have sex...'.

 

Maybe you needed to be there.

Edited December 9, 2011 by davetapson

[(Deon)]

So here is rudi-h, seems he has knowledge on the topic. He shows some frustration at the responses but gets on with the explanation. Compare this to the style chosen by the other person and what it shows up is the fool hardy adamant response of someone who does not have a factual case, other than just to know. How is his opinion expressed? Through what seems to be anger with an unhealthy dose of sarcasm.

 

TNT, if what you are in fact trying to say is, 'don't worry, your bike will be fine" say that next time and save us all your toy box tantrum.

 

As a reader, once I read TNT's response I could not fathom out what made it a stupid question. The only advice we seem to walk out of a bike shop with is the one of, "DO NOT USE A PRESSURE WASHER". Since so little care instruction is given at the time of our new purchase, we tend to take anything that is voluntarily offered and hold it in high regard. i.e. They said so little, this must be important... This is the general trend of SA service, work it out yourself mentality. Is the hub going the same way?

 

If I have, what I think is a good question that concerns me about my prized purchase, should I rather not ask it on a users forum? JB stated what most of us would think is the safer option... fortunately the tech has come far enough that we have good bearings hidden behind tight seals so if you only have roof racks, your bike should be ok.

[Wyatt Earp]

ag bliksem mekaar net en kry klaar...olie ten minste net moving parts en bolts sodat jy nie roes kry nie

:clap:

But you have to love Da Hub, especially the self proclaimed super experts.

[Tumbleweed]

Will do so. But then she is going to ask for matches. (Cheeky little bugger, she is...)

 

Which she won't be able to use at 100km/h in the rain…

[428 others]

I believe that if it cant hurt you it cant hurt your bike. and very honestly, i did the experiment by sitting on a bakkie in the rain before, water at 100km/h does not hurt on your body (maybe a little on your face)

 

How many beers?

[Kranswurm]

Plonkers........I had my old Cannodale with Headshok on the back and drove to CT thru torrential rain for hours.

Within a few days the needle bearings and plates were stuffed.

The oke at Cape Cycle Systems was adament that it was ingress of water from the trip.Why not.Its just a goddam cable tie which is not a perfect seal

[Iwan Kemp]

So here is rudi-h, seems he has knowledge on the topic. He shows some frustration at the responses but gets on with the explanation. Compare this to the style chosen by the other person and what it shows up is the fool hardy adamant response of someone who does not have a factual case, other than just to know. How is his opinion expressed? Through what seems to be anger with an unhealthy dose of sarcasm.

 

TNT, if what you are in fact trying to say is, 'don't worry, your bike will be fine" say that next time and save us all your toy box tantrum.

 

As a reader, once I read TNT's response I could not fathom out what made it a stupid question. The only advice we seem to walk out of a bike shop with is the one of, "DO NOT USE A PRESSURE WASHER". Since so little care instruction is given at the time of our new purchase, we tend to take anything that is voluntarily offered and hold it in high regard. i.e. They said so little, this must be important... This is the general trend of SA service, work it out yourself mentality. Is the hub going the same way?

 

If I have, what I think is a good question that concerns me about my prized purchase, should I rather not ask it on a users forum? JB stated what most of us would think is the safer option... fortunately the tech has come far enough that we have good bearings hidden behind tight seals so if you only have roof racks, your bike should be ok.

 

Sense prevails.

[Grebel]

I would rather transport on the roof than have all the k@k from the road thrown up by my own car all over my bike. Having said that though We drove to Sani Pass with our bikes behind our cars on a dirt road while it was raining. By the time we got to our destination, we could just make out the shape of a bike behind the car... A hose pipe sorted out the cosmetics and no ill effects for months to come after that.

 

If I was you though I would leave the bike at home. Problem solved.

[Robrider]

Lot of opinions again, but no fact. My pressure washer (and yes I use it to clean my bike) delivers water at a pressure of 110 Bar.

 

The equation to get water discharge velocity:

 

V = Sqrt (2 x g x h), where V is velocity, g is the gravitational constant and h is the water "head".

 

To convert "head" to pressure: P = rho x g x h; thus h = P / (rho x g), leaving V = Sqrt( 2 x (P / rho))

 

This equates, without losses to 148 m/s. With a small round orifice like the head of a pressure jet, the loss factor is roughly 0.6.

 

Thus the expected water velocity is 60% of 148 = 89 m/s

 

89 m/s = 320 km/h

 

So no, at 1/3 of the velocity of a pressure hose, I do not think the water ingress will be a big deal.

 

I believe that if it cant hurt you it cant hurt your bike. and very honestly, i did the experiment by sitting on a bakkie in the rain before, water at 100km/h does not hurt on your body (maybe a little on your face)

 

 

There's one problem with your calculation. If I stand a meter away from the pressure hose, it definitely doesn't hit me at 320km/h. If I stand 2m away, it is barely a refreshing breeze.

 

So there's also losses due to dispersion, and drag (or air friction), unless you put the nozzle right on top of the bearings, which will destroy them with out a doubt.

 

You have also concluded that 320km/h will destroy the bearings, but a third of that won't... I don't see how that's a valid point, because what is the "cut-off" velocity that won't destroy your bearing then.

 

Having said all that, I'm only commenting on the theoretical argument. I think its a stupid argument and I don't think it will affect your bike.

 

If we really wanted to get technical we could look at velocity of water sprayed up from the wheels, effects of putting the bike forward facing on the roof vs side facing on the back, etc etc

[rob_mtb]

I took TNT's approach once on a 5 hour torrential rain drive from Knysna back to CT. Needless to say, my bearings were stuffed when I got back. Had to redo the headset and all of my rear suspension bearings.

 

I think the Glad wrap idea is great and I reckon that would have helped a bit. In hindsight, I think you'd be better off removing the forks and wheels, and maybe stick them in the boot, and Glad wrap the rest. Rain has a sneaky way of getting into things.

 

I also think this TNT vs JB thing is really tiring. JB has a lot of good info on him, he's fixed and tuned my suspension before and he knows bikes. Who is TNT? Just some aggressive troll on the web hiding away who he is, constantly having wise things to say. Johan uses his real name, and stands by what he says with actual technical input.

 

Who are you TNT? Please state your name and occupation.

[gummibear]

I have always used municipal black bags and insulation tape to protect my bike when it's on my rack.Takes about 10-15 minutes to wrap and tape but your bike will be dry.