A Bikes Weight

[albrid-3]

over the past 45 years, there has not been a great change of weight saving between the model for example 1972 380 dry weight is 106 kg compare to a 2013 Husqvarna 310 109 KG kerb weight.

[TM BILL]

Dave your correct the overall weight has increased , however when you consider the added weight of water cooling , disc brakes , rear suspension components (not just 2 shocks bolted to the frame) way bigger forks and clamps plus a four stroke motor its impressive that the weight has remained simillar .

[djr]

Hello,
As has been said The modern Moto Cross / Enduro Bike is a lot more complex than a 1970s bike , so that is most likely why the weight has not decreased over the years.
Also I may be wrong but was there a minimum weight rule for Moto Cross / Enduro  introduced in the early 1970s ?
 I think to prevent manufacturers building ever lighter {but fragile/dangerous} bikes.
Trials bikes seem to have lost some weight over the years, I have a 1976 OSSA MAR & a 2010 GAS GAS 300.
I dont know the proper weights for these 2 bikes , but just from trying to lift them the OSSA is noticeably heavier !

[albrid-3]

When you put it into that contents yes your right Tm Bill.

[TooFastTim]

Dave your correct the overall weight has increased , however when you consider the added weight of water cooling , disc brakes , rear suspension components (not just 2 shocks bolted to the frame) way bigger forks and clamps plus a four stroke motor its impressive that the weight has remained simillar .

Aha! I see a flaw in your argument Baldrick! How come, with the addition of the same complexity, trials bikes weights have dropped by 30 Kgs in the same period?

[jerry]

A friends son said after riding my 40 year old Pursang" shit it feels light as a feather!" I allowed myself the indulgence of nodding sagely. J

[tony27]

Dave your correct the overall weight has increased , however when you consider the added weight of water cooling , disc brakes , rear suspension components (not just 2 shocks bolted to the frame) way bigger forks and clamps plus a four stroke motor its impressive that the weight has remained simillar .

Aha! I see a flaw in your argument Baldrick! How come, with the addition of the same complexity, trials bikes weights have dropped by 30 Kgs in the same period?

Magnesium, aluminium & reduced physical size/mass centralisation, mx bikes have got taller & longer as suspension increased but trials bikes haven't increased by much in suspension over the same period especially the forks
I remember reading that there is a limit to how much travel the front forks can have in a trials bike before it makes a real mess of the steering geometry, somewhere around 185mm which seems to be what they've settled on for years

[TooFastTim]

Good point(s) Tony

[Tahitian_Red]

I have a 1977 YZ400 and a 2008 YZ450F sitting side by side in my garage.  If anything I would say the 2008 feels a few pounds heavier lifting it on the stand, but not so much out on the track.

[80-85 husky]

Guys, with all the "fresh air" under the guards now, its a wonder new bikes aren't heaps lighter