CCM Frame 1973 1974

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Toots
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CCM Frame 1973 1974

Post by Toots » Sun Nov 14, 2010 12:32 am

This may be obvious to some of you out there - so I apologise in advance for my naivity - but what is the difference between a 1973 CCM frame and a 1974? :?:

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Re: CCM Frame 1973 1974

Post by minetymenace » Sun Nov 14, 2010 1:00 am

Just one, toots, just one. Its a CCM thing. :ban
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Re: CCM Frame 1973 1974

Post by johnmead » Sat Nov 20, 2010 12:46 am

I have one of each, a 73 608 with what looks like a BSA B50MX frame that was shot blasted and chrome plated. The 74 500 has a Reynolds frame that is polished and chrome plated.

Both frames look the same except for the finish.

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Re: CCM Frame 1973 1974

Post by Toots » Sun Nov 21, 2010 10:32 pm

Thanks John, very interesting and useful. Couldn't tell the difference and this explains why. Do you think a late '73 frame with the Eatough "EMC" label is likely to be Reynolds tubing? Finish looks good?

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Re: CCM Frame 1973 1974

Post by johnmead » Thu Nov 25, 2010 7:38 pm

I am not familiar with the EMX or Cotton MX bikes but if they are 60s to 70 vintage their frames were probably 541.

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Re: CCM Frame 1973 1974

Post by Mark Cook » Thu Nov 25, 2010 9:28 pm

Toots, I'll post some pics in the morning, they are very different. Though it's true to say the 73 looks a bit like a B50 frame, it's about half the weight.
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Re: CCM Frame 1973 1974

Post by Mark Cook » Fri Nov 26, 2010 10:06 am

This is the 73CCM Frame.
739.JPG
This is a 74CCM Frame.
741.JPG
As you can see the rear end of the frame has gone through a lot of changes. They are both made of the same materials, Although this 74 has had most of the plating stripped ready for repairs. Also they were both made by Mike Eatough's frame making company. They were both Chrome plated to the same standard.
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Re: CCM Frame 1973 1974

Post by Who » Fri Nov 26, 2010 1:13 pm

Just if somebodys intrested, I measured B50T frame 14.4Kg without swing arm

What Im intrested is how much ccm weights?

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Re: CCM Frame 1973 1974

Post by Mark Cook » Fri Nov 26, 2010 1:32 pm

This was all done a few years back, if you have the afternoon spare go hunting the old posts. I think it was to do with a 73CCM project.
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Re: CCM Frame 1973 1974

Post by Toots » Fri Nov 26, 2010 6:27 pm

Thanks Mark - pictures show the differences very clearly. It is interesting to see where the development was focused in 1974, which continued further in 1975 frames and beyond. Thanks for clearing that one up!

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Re: CCM Frame 1973 1974

Post by Mark Cook » Fri Nov 26, 2010 8:35 pm

There are three main leaps in frame design. upto 73. Then upto 78. All after have much more in common than you'd imagine. Hence the recommended class structure for the International CCM challenge, hosted by the Hereford boys and girls at Farliegh.
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Re: CCM Frame 1973 1974

Post by bigbeezas » Fri Nov 26, 2010 10:45 pm

Looks to a novice like me that the main difference between the 73 and 74 was the shock mounting position and the shape of the rear loop. Presumably the 74 had a longer swinging arm which together with the bottom shock mounting being located further forward gave more travel on the rear end. Correct me if I am wrong but I suppose this was matched by more travel on the front forks. Looks to me that this trend for more suspension travel then continued with further rear end development on the 75 and so it went on. The main driving force behind frame design being suspension improvement.
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