1wg conundrum

[fzrbob]

Hi all,

well the 1wg had its first trackday at oulton last week - what a day!!

anyway, after a fork oil change all is still a bit squidgy (nothing to do with the 15 1/2 stone rider!) After reading a few posts on here i have thought about upgrading the rear shock to the red r6 shock and changing the rear wheel to a 17" rim to get a better tyre choice (ex race tyres from a mate). Will an existing 1wg swingarm take a 17" rim spaced up or am i better swapping the swingarm for say a 3tj?

also, at the point of changing the rear rim i know i will have to change the front. will a 1wg take 3tg yokes? are the spindles the same/will the 3tj fit? i have some 3tj forks already and plan to change the front wheel to take a 120 profile (again tyres off a mate).

anyone any thoughts, ideas or suggestions

cheers

[thunderace]

The 1WG swingarm will take a 17" rim but I think you may be limited on tyre width, 140 IIRC. The 3TJ, again IIRC, will take up to a 160 width just about.

I think the 3TJ front end will fit straight on to the 1WG, I'm pretty sure the forks are the same diameter. I'm not 100% but you may need to use the 1WG stem.

[Kayla850]

An XJR400 rear wheel should fit straight in to the 1WG swingarm, but the disc is larger and you need a suitable caliper & hanger- there is no 'bolt straight in' way of doing a 17" wheel swap on the early FZRs. My old 3EN1 had a 160/60 fitted on a 5" wheel (in a different swingarm, granted) with no issues at all. Look for Mito rear wheels- they're 4 x 17 and are quite narrow across the hub. I'm working on fitting one to a 3EN1 swingarm that's going in my TZR250 at the minute. The early 3 spoke ones are quite cheap but you would need everything (wheel, disc, sprocket carrier, caliper and hanger) to make it work. As a minimum you need the wheel, disc and sprocket carrier because the Yam caliper and hanger can be used, but it gets a bit messy with spacers and stuff all over the shop.

If you decide to replace the swingarm with a 3TJ one you will need some bushes to reduce the diameter of the pivot tube down from 20mm to 16mm.

The 3TJ front end is completely different to the early 1WG front ends, from the fork diameters, down through the stem length, to the tip of the caliper bolt spacings. You need to swap the stems over at least, and they're often welded in place (some are, some aren't. Both of the ones I've had have been welded). To be honest, unless you've got a full 3TJ front end waiting to be fitted I'd write the whole thing off as a bad lot and start again with forks that take 100mm calipers. 3TJs use 83mm calipers and they're pretty sought after by YPVS owners so the prices are pretty high to buy a pair. Sorry to sound like the harbinger of doom but it'd be rubbish if you got into an expensive mess.

If it was me, which it's not, but if it was I'd look for a TRX850, Thundercat or FZR600R front end. It will bolt straight in to the 1WG frame, the forks are the same length (within 5 or so mm), they all use 100mm calipers, and they all use 3.5 x 17" wheels.

I've done the above mods to a 3EN1 (TRX/Thundercat front end and TRX back end) so I know for definite that they work.

edit- send me a PM if you want, I'm happy to help where I can

[Evilchicken0]

I agree with Kala on this - look for a Front end from the TRX, T'Cat or FZR600R Foxeye ... the ealy shape 600 Fazer is the the same too. The 100mm caliper spacings will take later Yam Blue Spot calipers so you'll get a useful upgrade to the brakes too.

Depending on the model 1WG - some 3en2 will take the 3TJ wheel with spacers but it's hit and miss - look for a rear end from the same bikes above.

[barryfzr]

I put a 3tj rear set up on my 1wg and hated the handling... I probably could have gone down to a narrower tyre width but with all the hassle I sold it on to Taggy(I think) on here who raced it awhile.

Turns out now the guys over the road who whosale bridgestones over here tell me b'stone have stopped selling the popular 090 (or the 092's cant remember) 18" tyres so I want to go back to a narrower 17" now. Last time I checked they had no fitment for my bike and they are the largest in the country.

I run stiffer fork springs in my fzr600 90'-93' forks. these slot straight into the 1wg yokes and have the 100mm blue spot caliper mounts (89' had 83mm beware ;o) These forks are an improvement with the stiffer fork springs but have no rebound damping. They are fine for my road riding though. I probably should have put the thundercat forks on when I had a set but I didnt realise they were cartridge at the time (more fitting work mind) I guess it depends how serious you are about your racing.

After some research I've just got hold of some tzr125 magneisium wheels Just got some special bearings for the front and made a new spacer up and saved over 1kg on the front wheel.

The back is a 17" and is designed to take a 140 section rear. I'm hopefully going to have a play this week when my posh new shock finally arrives. There are a lot of tzr125 models and I think I might want to swap the rear for a more beefier model(brembo) wheel. They look very spindly compared to my 400 wheels! but I'm hoping riding solo should not put anymore stress on them than a 2 up on a 125 (higher speeds and forces poss though)

[Evilchicken0]

Dunlop Alpha 10's come in 150/60-HR18 and 110/70-HR17

[fzrbob]

Hi Guys,

thanks for all the input - i will do some scratching around to get some bits and give it a go.

bob

[Taggyd]

the 17inch rear mod works well with a bit of tweaking, did have to drop the yoke 10mm down the tubes to get the turn in sorted (race bike) and had to play with the dog bone lengths, think it ended up with sv650 ones. That got it spot on height wise using the standard length shock.