Rim is getting bent frequently

[s.v.l.srinivasa raghavan]

Hi All,

I own a btwin riverside 500, My cycle rim is getting bent frequently. My weight is around 85 kg and usually i car a tiffin box (atmost 1 / 2kg). My cycle rim is frequently getting bend and few forks are also getting broken. 

Not sure why this is happening. Any clue / help be really appreciated.

Thanks

Srini

[Pradeep Naidu]

You need to true the wheel and change a set of new spokes if you think necessary.
Check the right psi.

If none works
Change to a better wheel. You can pick them up at BOTS, wheelsports, happy earth..

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[s.v.l.srinivasa raghavan]

Hi Pradeep and all,

What should be the right psi. Usually i fill more air (till i cannot press the tire anymore) 

regards,

Srini

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Cheers
Srini

[justin joseph]

That's a good starting point, to check tyre pressure. The way you are doing it might not be optimal these days, it worked in the old days if bsa-slr.  The tyre should have the rating printed on the side wall somewhere.  It's well worth the investment in buying a pump with a pressure gauge. 
There are YouTube videos of checking wheel true, check that like Pradeep said. The spoke tightener can be bought for like 5 bucks from local bike stores.  Physically check if there are loose spokes.

[berkeleydb]

I assume it's the rear wheel that is getting bent repeatedly? Since that is the one that takes more weight.

While "fast" is subjective, do you tend to go over bumps / through potholes at fairly high speed? That can put a lot more stress on the wheels.

Also, do you get off the saddle at bumps/potholes? Being on the pedals distributes the weight more evenly across the front & rear wheels. Otherwise, the rear wheel will be bearing the major brunt of the increased stress at bumps/potholes.

Might want to review those aspects of your riding style.

-{db}.

[s.v.l.srinivasa raghavan]

Hi Berelydb,

Yes you are right, the rear wheel is the one. I dont get off my saddle, but i slow down a bit while in humps and pothole.

Regards,

Srini

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Cheers
Srini

[Prashanth Chengi]

I assume you mean 'spokes are getting broken' and not 'forks are getting broken'. 
When you have spokes breaking during normal use, it means that the tensions in the wheel are probably fully compromised.  While the mechanic who adds the new spokes ought to true the wheel after the additions, chances are that the other spokes are already weakened.  This would lead to a cyclic problem, as weakened spokes are poor at maintaining tension.  Your best bet is to simply buy a new wheel from Decathlon, which is compatible with your bike, and then ensure that you keep the tires inflated to recommended pressures. Since you are 85 kg, I'd recommend that you stay closer to the higher end of the recommended pressure range; e.g if it says 50-85 PSI, try 75. 

Regarding checking tire pressures, ensure that you have a good pressure gauge. Many pumps come with cheap built in pressure gauges which are extremely inaccurate; get good pumps with integrated pressure gauges, or buy standalone pressure gauges like the Topeak D2 (http://www.topeak.com/products/pumps/smartgauge_d2), which are accurate and easy to use.  If you use the bike everyday, a check once a week ought to be ok, but if it's less frequent, check before each ride. 

/Prashanth

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