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Posted by Tud on July 30, 2008, 8:57 am
Greetings. I'm working on putting a '72 Triumph Daytona together and I
needed to replace the front end. I ended up with the triple trees and forks
from a 1972 Suzuki GT750, which I managed to mount to the Triumph but it
didn't come with a wheel. I'm looking for alternatives to the original
GT750 drum brake, since I can't afford one as they seem to be favored by
vintage class racers. Does anyone know of an alternative to the GT750 drum
brake that will fit the 1972 front end? I'm wondering if the same vintage
GT550 or GT380 drum brake wheel and axel will fit the GT750 front end, or if
there are any other manufactures' wheels that will fit.
Failing this, would a slightly later model Suzuki disk brake wheel and lower
legs fit the 1972 triple trees and forks? In other words, would, let's say,
a 1974 GT550 wheel and forks work with the GT750 triple trees, or are the
forks a different diameter and the spacing different? The lower legs I have
now don't have the mount points for a disk brake, so I would either have to
replace the lower legs (or at least one of them), or the entire forks. This
then gets me into the question of whether the distance between the forks are
the same for the '72 GT750 triple trees and a later model disk brake setup.
If the drum setup is wider then I may be able to get away with a spacer. It
also prompts the question, are the diameter of the forks the same for
different years of Suzuki's in the early 70's? Is teh '72 GT750 front forks
the same diameter as, say, the '74 GT550 with disk brakes?
Lot's of questions, so I'm hoping there's a vintage Suzuki guy floating
around in here that can help.
Thanks in advance,
Tud
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Posted by . on July 30, 2008, 10:05 am
> Failing this, would a slightly later model Suzuki disk brake wheel and lo=
wer
> legs fit the 1972 triple trees and forks? =EF=BF=BD
Suzuki was very slow to change anything in the 1970's and early
1980's.
Axles were the same diameter so they could use the same bearings and
oil seals.
I know for a fact that a 1974 GT750 front hub bolts up to the disks of
my 1982 GS1100. The axle is the same diameter too.
http://www.powersportspro.com/pages/parts/viewbybrand/parts.aspx
1972 GT750 upper triple clamp SKU: 51311-31000-019
BRACKET, FORK UPPER
1972 lower triple clamp SKU: 51410-31001
BRACKET, FORK LOWER
1974 upper triple clamp SKU: 51311-31700-019
STEERING STEM HEAD L,M,A; TO 51311-31701-019 L,M,A; TO 51311-31701-019
1974 lower triple clamp SKU: 51410-31700
STEERING STEM L,M,A; TO 51410-15210 L,M,A; TO 51410-15210
If you look at the steel fork stanchion tubes, you might find that the
1972 and 1974 forks have the same stanchion tubes, so the outer
aluminum sliders of a 1974 probably bolt right onto 1972 damper rods.
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Posted by Tud on July 30, 2008, 1:33 pm
. wrote...
> Tud wrote:
>
>> Failing this, would a slightly later model Suzuki disk brake wheel and
>> lower
>> legs fit the 1972 triple trees and forks? �
>
> Suzuki was very slow to change anything in the 1970's and early
> 1980's.
>
> Axles were the same diameter so they could use the same bearings and
> oil seals.
>
> I know for a fact that a 1974 GT750 front hub bolts up to the disks of
> my 1982 GS1100. The axle is the same diameter too.
>
> http://www.powersportspro.com/pages/parts/viewbybrand/parts.aspx
Fantastic site, this will help a great deal in narrowing down (or
broadening) my options.
> 1972 GT750 upper triple clamp SKU: 51311-31000-019
> BRACKET, FORK UPPER
>
> 1972 lower triple clamp SKU: 51410-31001
> BRACKET, FORK LOWER
>
> 1974 upper triple clamp SKU: 51311-31700-019
> STEERING STEM HEAD L,M,A; TO 51311-31701-019 L,M,A; TO 51311-31701-019
>
> 1974 lower triple clamp SKU: 51410-31700
> STEERING STEM L,M,A; TO 51410-15210 L,M,A; TO 51410-15210
Sweet, looks like I can go with a disk brake.
Thanks a bunch.
The old extended Triumph front end:
http://tinyurl.com/58sa9u
The GT750 front end:
http://tinyurl.com/66fkxb
Tud
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Posted by . on July 30, 2008, 2:26 pm
> >http://www.powersportspro.com/pages/parts/viewbybrand/parts.aspx
>
> Fantastic site, this will help a great deal in narrowing down (or
> broadening) my options.
>
> > 1972 GT750 =EF=BF=BDupper triple clamp SKU: 51311-31000-019
> > 1974 upper triple clamp SKU: 51311-31700-019
I hopet the 1972 and 1974 Water Buffalos having the exact same part
number triple clamp should dispel any doubt about the diameter of the
fork tubes and their spacing.
The difference in dash numbers on the lower triple clamp is probably
due to the slight difference in casting to accomodate the brake hose
junction fitting...
As Suzuki proceeded to accomodate customer demand for radical colors
and styling, many perfectly interchangeable basic part numbers gained
a plethora
of dash numbers
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Posted by Tud on July 30, 2008, 3:18 pm
. wrote...
> Tud wrote:
>
>> >http://www.powersportspro.com/pages/parts/viewbybrand/parts.aspx
>>
>> Fantastic site, this will help a great deal in narrowing down (or
>> broadening) my options.
>>
>> > 1972 GT750 �upper triple clamp SKU: 51311-31000-019
> > > 1974 upper triple clamp SKU: 51311-31700-019
>
> I hopet the 1972 and 1974 Water Buffalos having the exact same part
> number triple clamp should dispel any doubt about the diameter of the
> fork tubes and their spacing.
Possibly, assuming that the diameter and spacing is determined by the 51311
number and not the 31000 versus 31700 number.
> The difference in dash numbers on the lower triple clamp is probably
> due to the slight difference in casting to accomodate the brake hose
> junction fitting...
So the main part number is the 51311 and the numbers after that aren't as
critical, is that correct?
I'm thinking I may be wrong in that assumption. I typed in 51311 into that
web page and got back everything from a 2008 GSX1300BKA to a 1968 50M12.
The 51311-31000 narrows it down to just one year, the 1972 GT750 upper
triple tree that I have. When I get home I'll see if I can confirm this
number on the part itself. I'm hoping my starting point (the current triple
trees) isn't a one year item. The axel for the 1972 GT750 seems to fit a
whack of bikes, so I'm assuming that the width is at least the same as other
bikes.
I'm going through the page you pointed me to and am building up a list of
parts that should be interchangeable. Obviously I'm not going for an
accurate restoration, just trying to find something that'll work to get the
bike on the road.
> As Suzuki proceeded to accomodate customer demand for radical colors
> and styling, many perfectly interchangeable basic part numbers gained
> a plethora of dash numbers
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