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Old 04-29-2013, 07:29 PM   #1
fwalti OP
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Convert F650GS to F700GS Double discs

I was wondering if anyone had tried to put the 700's double discs on an F650GS?
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Old 04-29-2013, 09:21 PM   #2
vtbob
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Why would you want to? Just for looks?

The single disc F650GS stops faster that the dual disc F800GS per Motorcycle consumer news tests. check it out.

The limiting factor is not disc power but tire to road adhesion. The F650GS has a wider dire with more pavement contact area...that is why it stop shorter than the F800GS

The dual disc adds more unsprung weight(a bad thing) and more complexity.

Modern disc offer huge stopping power. Most often single disc stopping power exceeds the tire limits...so a dual disc in not needed. On racing bikes the dual disc help offest the racing heat build up.....which most of us never experience on the road.

I'm sure there will be interesting responses
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Old 04-29-2013, 09:35 PM   #3
BcDano
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vtbob is bang on. We have one of each in the family (800 & 650 twin) and the 650 stops great. Fantastic now that we have upgraded the forks with heavier springs and Racetech emulators. No more diving under heavy breaking.
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Old 04-29-2013, 11:10 PM   #4
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Quote:
Originally Posted by vtbob View Post
Why would you want to? Just for looks?

The single disc F650GS stops faster that the dual disc F800GS per Motorcycle consumer news tests. check it out.

The limiting factor is not disc power but tire to road adhesion. The F650GS has a wider dire with more pavement contact area...that is why it stop shorter than the F800GS

The dual disc adds more unsprung weight(a bad thing) and more complexity.

Modern disc offer huge stopping power. Most often single disc stopping power exceeds the tire limits...so a dual disc in not needed. On racing bikes the dual disc help offest the racing heat build up.....which most of us never experience on the road.

I'm sure there will be interesting responses
It may stop faster once, but running hard in the twisties I have had that front disk smoking pretty good on the wifes 650 twin. The F8 has noticeably less brake fade when running hard consistently, especially when 2 up or carrying a load.

Ryan
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Old 04-30-2013, 09:24 AM   #5
fwalti OP
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Quote:
Originally Posted by vtbob View Post
Why would you want to? Just for looks?

The single disc F650GS stops faster that the dual disc F800GS per Motorcycle consumer news tests. check it out.

The limiting factor is not disc power but tire to road adhesion. The F650GS has a wider dire with more pavement contact area...that is why it stop shorter than the F800GS

The dual disc adds more unsprung weight(a bad thing) and more complexity.

Modern disc offer huge stopping power. Most often single disc stopping power exceeds the tire limits...so a dual disc in not needed. On racing bikes the dual disc help offest the racing heat build up.....which most of us never experience on the road.

I'm sure there will be interesting responses
Quote:
Originally Posted by grndzr0 View Post
It may stop faster once, but running hard in the twisties I have had that front disk smoking pretty good on the wifes 650 twin. The F8 has noticeably less brake fade when running hard consistently, especially when 2 up or carrying a load.

Ryan
Well, I use to think the single brake was good enough too. Then I just spent 600 miles riding through the mountains and found the brake fading several times -- that was a first. So, I got to wondering if the 700Gs's double discs would be better
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Old 04-30-2013, 09:52 AM   #6
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Yup, would be better. Probably need a whole front end swap though. Fork, wheel, MC, additional caliper and hoses.

Could be considerably easier and maybe cheaper to get a used F800 unless the height is an issue.
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Old 04-30-2013, 09:56 AM   #7
fwalti OP
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I would have (probably) bought the 800 the 1st time around, but height is a big issue for me: ) Hence, i've essentially made my 650 into a mini GS capable of on/off stuff pretty well. The brakes are acceptable, I was just hoping that another disc, caliper and some hoses would have been all that's necessary: )
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Old 04-30-2013, 10:07 AM   #8
epicxcrider
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The fork on the F650 only has one brake mount, so you'd have to get a fork, wheel, caliper and hoses from an F700. the master cylinder is probably different for only driving one brake, so getting one from an F700 or 800 would be a good idea.
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Old 04-30-2013, 01:11 PM   #9
Metalsapo
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Thumbs down



It is about the looks, jajajja, of course, i have a F650GS twin also and the only thing that i envy the F800GS is because the front suspension looks, double disc, bigger inverted forks, is just "bad a.." , just like a big horse stallion.

Now, i love my motorcycle, every detail of it, and drive allot, and i see her as a beautiful and capable mare, i have the F650GS by luck, i was looking to buy a G650GS used, but none, and one day the called me for a try for the F650GS and i was in love, F800GS was way expensive for me and way tall, and like nervous horse, for a first GS my motorcycle i think is perfect.

Also the break overuse is not a bad driving habit?
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Old 05-01-2013, 01:17 AM   #10
grndzr0
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Quote:
Originally Posted by Metalsapo View Post

Also the break overuse is not a bad driving habit?

Me? Bad driving habits? Never....

I would call them spirited driving habits!!

Ryan
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Old 05-01-2013, 05:21 AM   #11
epicxcrider
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Overuse is subjective. :)
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Old 05-02-2013, 04:19 AM   #12
Snowy
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I had read quite a lot of hype about dual v single disc. I changed to a single on my F8. I changed the master cylinder also.

Verdict?




Meh! I think it works far better at legal speeds, not quite as good going flat out 2 up.

But that's exactly what I expected.
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Old 05-02-2013, 08:09 AM   #13
epicxcrider
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Quote:
Originally Posted by Snowy View Post
I had read quite a lot of hype about dual v single disc. I changed to a single on my F8. I changed the master cylinder also.

Verdict?




Meh! I think it works far better at legal speeds, not quite as good going flat out 2 up.

But that's exactly what I expected.

If I were only going to ride in the woods and do some occasional spirited riding around town I'd drop the other disc and abs just to save the weight. Having two is nice when the thing is all loaded up with gear or another person and you want to have some fun in the hills.
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Old 05-02-2013, 08:14 AM   #14
epicxcrider
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Quote:
Originally Posted by Snowy View Post
I had read quite a lot of hype about dual v single disc. I changed to a single on my F8. I changed the master cylinder also.

Verdict?




Meh! I think it works far better at legal speeds, not quite as good going flat out 2 up.

But that's exactly what I expected.

If I were only going to ride in the woods and do some occasional spirited riding around town I'd drop the other disc and abs just to save the weight. Having two is nice when the thing is all loaded up with gear or another person and you want to have some fun in the hills.
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