Author Topic: Cast 2.5" front, 3.5" rear options?" (Read 6859 times)

turboguzzi · « **on:** January 20, 2011, 03:40:23 pm »

hope sam doesnt kick me out of here as its not for a sohc.... but thought some of you might have some ideas

always dealt with spokes so need help

looking at what cheap options (not marvic) are out there for cast wheels, say 2.5" X 18" front and 3.5" X 18"

the original cast 2.15" / 3" in the GPZ i am building are super heavy and also limit my choice of tires size,

will gonna run them initially but would love to loose some weight there.

Thing is that other than early 18" GSXR750 rims (which were almost too light and tended to crack) I cant think of any other posibilities.

Other ideas?

TG

mlinder · « **Reply #1 on:** January 20, 2011, 03:44:48 pm »

Convert to hover bike.

Weighs a lot less.

Retro Rocket · « **Reply #2 on:** January 20, 2011, 04:00:30 pm »

Hmmm, i was going to suggest the early Gixxer rims, have seen them on period race bikes and being cheap, couldn't you replace them if they cracked.?

This is a members bike, can't remember who's but i would find out and PM them and see what he thinks....couldn't hurt....

Mick

754 · « **Reply #3 on:** January 20, 2011, 08:28:41 pm »

Usually not cheap, and not cast... but Astralites came in those widths..

turboguzzi · « **Reply #4 on:** January 20, 2011, 11:10:03 pm »

it's member 500four's bike, and yes those are gsxr wheels, just like those on my badly missed 1987 gsxr50

They are certainly on my list but the two problems at this point are that they are becoming more and more rare and the front especially is super flimsy.

Simply double checking with you guys, maybe there is some model that i am overlooking but they also might be the only option out there,

Retro Rocket · « **Reply #5 on:** January 20, 2011, 11:24:41 pm »

Quote from: turboguzzi on January 20, 2011, 11:10:03 pm

it's member 500four's bike, and yes those are gsxr wheels, just like those on my badly missed 1987 gsxr50

They are certainly on my list but the two problems at this point are that they are becoming more and more rare and the front especially is super flimsy.

Simply double checking with you guys, maybe there is some model that i am overlooking but they also might be the only option out there,

What about the GSXR1100 J, it was the first model with 3 spoke rims{last of the slab sided gen 1 bikes} and i thing the back is 4.5 inch and the front is the same size as the earlier models, wheels are 18 inch....

Mick

turboguzzi · « **Reply #6 on:** January 21, 2011, 01:31:49 am »

Quote from: Retro Rocket on January 20, 2011, 11:24:41 pm

Quote from: turboguzzi on January 20, 2011, 11:10:03 pm
it's member 500four's bike, and yes those are gsxr wheels, just like those on my badly missed 1987 gsxr50

They are certainly on my list but the two problems at this point are that they are becoming more and more rare and the front especially is super flimsy.

Simply double checking with you guys, maybe there is some model that i am overlooking but they also might be the only option out there,

What about the GSXR1100 J, it was the first model with 3 spoke rims{last of the slab sided gen 1 bikes} and i thing the back is 4.5 inch and the front is the same size as the earlier models, wheels are 18 inch....

Mick

rulebook says 3.5" max

Triffecpa · « **Reply #7 on:** February 15, 2011, 10:51:55 am »

FZ750 is an option for the rear. They ran a 16" front wheel though.

I run the GSXR wheels on a couple of my race bikes and have not experienced any cracking.

TR

kos · « **Reply #8 on:** February 15, 2011, 11:01:26 am »

Check your tyre options if you run 16" front wheels. not many out there. We are running a VR750F '86 with 16" front and have only 2 choices in tyres.

kos

turboguzzi · « **Reply #9 on:** February 15, 2011, 01:26:11 pm »

Quote from: Triffecpa on February 15, 2011, 10:51:55 am

FZ750 is an option for the rear. They ran a 16" front wheel though.

I run the GSXR wheels on a couple of my race bikes and have not experienced any cracking.

TR

good to know about the FZ's, rear gsxr wheels are becoming expensive it seems,

our rules require 18" rims . no 16"s or 17"s allowed.

754 · « **Reply #10 on:** February 15, 2011, 09:51:03 pm »

Some of the earlier CBR 600s had a 3 (S shaped)spoke red wheels, the rear being 18 or 17 x 3.5 inch.. use a 3 bolt disc on the rear..

too bad you are not here, I happen to have a set..

turboguzzi · « **Reply #11 on:** February 15, 2011, 11:49:33 pm »

Quote from: 754 on February 15, 2011, 09:51:03 pm

Some of the earlier CBR 600s had a 3 (S shaped)spoke red wheels, the rear being 18 or 17 x 3.5 inch.. use a 3 bolt disc on the rear..

too bad you are not here, I happen to have a set..

just checked and it gives me rear as 17"

754 · « **Reply #12 on:** February 16, 2011, 06:33:13 am »

Another is a VFR rea, it is 3.5 or 4 , pretty sure some are 18.. as I mentioned it to an owner of one. I told him I thought the one I have was 18, but some are 17 inch.

simon#42 · « **Reply #13 on:** February 16, 2011, 02:22:36 pm »

have a look at any wheels designed for the mid 80s tz Yamaha's pretty sure the n, s and possibly t models had these sizes as standard . the original yamaha wheels where a 3 spoke design and quite light . in the uk the rules mean that very few of these are raced [ if any , they where not a great bike ] so perhaps you could find a set . bill howarth has imported quite a few of these from japan over the years , most go to collectors who have no need for spare wheels , its possible he may have a set . i would think a set would be worth about £400 , is this in your price range , or do i have to rack my brains again!

turboguzzi · « **Reply #14 on:** February 16, 2011, 02:47:06 pm »

Quote from: 754 on February 16, 2011, 06:33:13 am

Another is a VFR rea, it is 3.5 or 4 , pretty sure some are 18.. as I mentioned it to an owner of one. I told him I thought the one I have was 18, but some are 17 inch.

Own a VFR (albeit an RC36) and can tell you straight away that the early VF750F had 130-18" rears with 3.00" rims, same as my GPZ....so no luck here either.

Quote from: simon#42 on February 16, 2011, 02:22:36 pm

have a look at any wheels designed for the mid 80s tz Yamaha's pretty sure the n, s and possibly t models had these sizes as standard . the original yamaha wheels where a 3 spoke design and quite light . in the uk the rules mean that very few of these are raced [ if any , they where not a great bike ] so perhaps you could find a set . bill howarth has imported quite a few of these from japan over the years , most go to collectors who have no need for spare wheels , its possible he may have a set . i would think a set would be worth about £400 , is this in your price range , or do i have to rack my brains again!

400 pounds is not bad considering that the new 18" marchesinis/morris, etc. being made now are in the +2000 euro range. Not super high priority right now as bike has yet to stand on its feet yet, but if you hear about something let me know. some doubts regarding strength when used on a 165kg GPZ750 rather than a 125kg TZ, but life is too short not to try

The funny thing is that after all this rim search, turns out that the only racing tires that could work on a 3.5" rim ar ethe 140-150 AM23. Dunlop doesnt make anything 18" wider than the KR164 i believe.

simon#42 · « **Reply #15 on:** February 16, 2011, 03:11:38 pm »

the 130 am23 works well on a 3 and a half inch rim [ although they dont recommend it ] and dunlop do a gp 70 that works well on tz 750s using that rim size

turboguzzi · « **Reply #16 on:** February 17, 2011, 09:30:17 am »

what's a dunlop gp70? tried to google it but can see any references....

is this dunlop full list?

http://www.motopsychos.co.uk/dunlop-fitment-guide-354-c.asp

simon#42 · « **Reply #17 on:** February 17, 2011, 10:26:13 am »

no that is not a full list of dunlop tyres , dunlop do from time to time make a special batch of tyres for a specific bike . the tyre i am referring to is a GPR70 SP 150/60R 18 , i think it was made for the three cylinder triumphs [ the old ones ] . but will work well on other bikes . the problem with dunlop is if you dont know what to ask for you dont get . if i where you tg i would give them a ring and tell them what your after , if they wont send one to italy you can have it sent to me and i will forward it for you

Leino · « **Reply #18 on:** February 18, 2011, 12:08:47 am »

GSX-R 1100 J 18" front, like someone mentioned, early FZR 600 rear,that's 3½" x 18".

turboguzzi · « **Reply #19 on:** February 18, 2011, 04:32:03 am »

Thanks simon, will definetely keep your proposal in mind if i jump up to a 3.5 rim....

....like with the FZR600 one i've already located... Thanks for the great tip Leino! Kind of crazy that Yamaha went from 17" in 89' to 18" in 91', would have never guessed!

Where are you in FI? Used to spend time in Turko some years ago...

TG

Leino · « **Reply #20 on:** February 18, 2011, 05:55:16 am »

I live in Turku but other than that I'm OK, just ask Sam or Mike

Sam Green Racing · « **Reply #21 on:** February 18, 2011, 06:00:13 am »

I haven't a clue what he's talking about Yo.

Sam.

Leino · « **Reply #22 on:** February 18, 2011, 06:06:34 am »

Quote from: SamCB750A on February 18, 2011, 06:00:13 am

I haven't a clue what he's talking about Yo.

Sam.

Should have known it was a bad idea to drag you in to this conversation...

Sam Green Racing · « **Reply #23 on:** February 18, 2011, 06:49:38 am »

Leino · « **Reply #24 on:** March 03, 2011, 10:54:53 pm »

A bit off topic, but this GPz you are building... is it a 750?

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Author Topic: Cast 2.5" front, 3.5" rear options?" (Read 6859 times)