Dura Ace 7300 difference to 7800

[jstal40024]

I have a racing bike with Shimano Dura Ace 7300 group set, dura ace chain 18spd, 52/39 cassette 11/23. I was wondering if I wish to replace any parts would 7800 parts be a direct replacement. Sorry if this question sounds very basic but I am very new at cycling.
Thanks.

 

[fossyant]

That's 9 speed and DA 7700. 7400 is 8 speed, 7700 is 9 speed and 7800 and 7900 10 speed.

Mechs should be compatible, although you'll have to watch sprocket spacing.

 

[dellzeqq]

http://www.sheldonbr...m/dura-ace.html this may be of help. Beware 'A' and 'B' chainrings!

This requires that the chainrings be used in matched sets. Shimano has two "road" sets, designated "A" and "B".

• Set "A" uses a 42 tooth small ring, and a corresponding "A" type 53.
• Set "B" uses a 39 tooth small ring, and a choice of "B" type 52 or "B" type 53

 

[TheBoyBilly]

.....'but I am very new at cycling'...........

With DuraAce? I'm impressed.

Bill

 

[jstal40024]

Does this mean dura-ace 7300 is not correct, because this information was taken from the details when I bought the bike off flea bay.
The details are:- 18spd, groupset dura-ace 7300, chain set 52/39, cassette dura-ace 11/23. English BB.

The reason's for asking is simply to replace parts as and when required, but I just cannot find any info on dura-ace 7300 just 7800, 7900 etc and what it all means with these numbers.

The bike is a f.j wilson champion roadbike built in sheffield uk, about 5 years old but in good condition.

New to cycling is true, the last racing road bike I used was over thirty five years ago and have things changed.

So be gently people some one has to start somewhere.

 

[jstal40024]

Thankyou Dellzeqq just been to the web site you pointed at.

Will need a bit of time to read.

Thanks

 

[TheBoyBilly]

Sorry jstal I was just teasing, but DuraAce (to me at least) is top-range kit in whatever guise. To start out as a 'newbie' with that sort of equipment is well, how can I say it, not the norm. I try to keep my bikes below the Cycle2Work threshold and DuraAce, Ultegra and, mostly, even 105 can be out of reach on a new bike. If you have it more power to your elbow.

Bill

 

[TheDoctor]

Agree - Dura-Ace is top-end stuff, and well above my budget. It's only recently I've got up to the dizzying heights of 105!!

To answer the question - DuraAce stuff is now 10 speed, so when you replace the chain and cassette, stick with 9 speed to match your current STI shifters. Mechs should last a good long while - I've only replaced mechs after catastrophic mechanical failure, often rider and / or alcohol induced.
*not envious. Not at all. Not even a little bit*

 

[andy_wrx]

I take it that it wasn't this one from eBay ?
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=220671176710

 

[fossyant]

If the kit's Dura Ace, it will be printed (or engraved) on each part. To find out which series it is, look on the reverse side of the rear mech, or cranks and there will be a 4 digit number....eg. 7402, 7700 etc.

PS DA kit doesn't wear out if looked after. Only need to replace chains, sprockets and chain rings etc.

 

[jstal40024]

Fossyant

Thankyou, after digging around I found a magnifying glass with built in light in the garage and used it to go over the bike and you are right, I found a number on the jockey wheel at the rear of the bike 7700 stamped in really small lettering.

Other parts found included, Dura-Ace Flight Deck brake and gear change levers, chain HG-93, crank A-52, rear gears AD. This means info on flea bay was incorrect and now I can source the correct spares over the winter to maintain my bike.

No andy_wrx not that bike, my bike I was told is about five years old and weighes in at 6.8kg, not the reason for buying. I bought the bike because it looked good and was the right size for me based upon all the info I could find about how to measure yourself to fit a bike.

After riding the bike it felt good, except for my body which is another story, the ride was smooth, gear change slick, brakes even with no rubbing and best of all I fitted the bike and enjoyed the ride. Gear changing whilst braking is practice makes perfect and the first few times were a bit wobbly.

Thanks

 

[fossyant]

Post a good picture of it and we'll tell you exactly what's what. A 52 is Chainring Set A, 52 teeth. - Look on the back of the crank and you'll get the model, or post a picture and we will be able to tell from looking.