Wtb A Heavier Rear Spring?

[magellan]

Hi all,

My wife and I ride two-up all the time with 6th gen side bags and Givi-knock-off top box, and although I've upgraded to a 929 rear shock, I'm still at a stock spring rate, one click off max preload. It's time to beef it up. I weigh 180 and she weighs 135, so I figure we weigh 360-380 with loaded luggage. Suggestion for spring rate and where to get one?

Thanks!

[flyguyeddy]

Hi all,

My wife and I ride two-up all the time with 6th gen side bags and Givi-knock-off top box, and although I've upgraded to a 929 rear shock, I'm still at a stock spring rate, one click off max preload. It's time to beef it up. I weigh 180 and she weighs 135, so I figure we weigh 360-380 with loaded luggage. Suggestion for spring rate and where to get one?

Thanks!

no suggestion on rate, but hypercoil would be the place to go

[magellan]

Anyone know what the specs are for a stock 929 spring? Length, inside diameter, stock rate? Is the a place I can look up such info?

[Baileyrock]

Anyone know what the specs are for a stock 929 spring? Length, inside diameter, stock rate? Is the a place I can look up such info?

Same as the VFR, 15.3 kg or aprox 858 lbs. :thumbsup:

At 190 lbs I run a 19kg(1056lbs) rear spring just for solo rip'en. Do you always ride double ?

I would buy a 18-19 kg rear spring and .90 kg fronts and you'll be much happier solo or two up! :thumbsup:

Any standard after market 2.250 ID spring will work, You'll have to be more exact of spring length in order to use the stock 929 pre-load adjuster.

If the bike is only used for two-up touring with bags, I would go .95 front and between 19-20 kg rear. :thumbsup:

ps do Not just stiffen the rear, you need to change both for the beat and safest results.

[Veefer Madness]

OOOOOOOO...........

Sounds like a Perfect Racetech/ELKA Group Buy Candidate!!!!! :thumbsup: <_<

Signed:

Fly in the Ointment :goofy:

AND YOUR SOUL TOO!!!

[Darth Bling]

Anyone know what the specs are for a stock 929 spring? Length, inside diameter, stock rate? Is the a place I can look up such info?

Use the search function! :goofy:

Sorry, couldn't resist. :P

To quote myself from a post in another thread (here):

The free length of the stock 929 rear spring is about 6 7/16 inches.

So, I would probably go with a 1092 Ohlins spring if I were you.

Loni, you should contact that Ohlins Spring guy on ebay and see if he's still selling Ohlins springs. The 1092 springs are 170mm (6 11/16 inches) long. So you'd probably want that spring around 18 kg, no stiffer. Because the Ohlins are 0.3" longer than the stock 929 spring, you'll have extra preload. If you go with a spring rate too high (like I did with the 1099 spring on the 6th gen stock shock, see here), you may find yourself topping out the shock. :goofy:

Don't forget to get matching fork springs too! :goofy:

EDIT: Hmm, just read in the Ebay Ohlins Spring thread that the seller has scrapped all the springs. <_<

[turtlecreek]

i am 270 lbs and using an 18kg on my f4 shock. it is plenty stiff at only 1/2 setting on preload. cant imagine you would need more than that as i am set at 25mm sag for hard twisty riding

[Guest]

Where to buy Hyperco springs? hrpworld.com.

A Hyperco spring is a Hyperco spring is a Hyperco spring. There ain't no such thing as a motorcycle spring or a car spring when dealing with Hyperco springs. These guys specialize in sports car suspension parts and are Hyperco and Penske dealers. They sell Hyperco springs for $66.95 and ship them for $8.95.

There are only three variables to a Hyperco spring:

1. Length

2. Internal diameter

3. Spring rate

If you know what you want, you can save $33 per spring going to them as opposed to one of the motorcycle suspension speciality shops.

BTW, Penske shocks use either a 6" or 7" spring (most common is the 6" length). The spring needed for a Penske is 2.25" ID. You won't believe the range of spring rates available.

To convert lbs/in to kg/mm, simply divide by 2.2 (2.2 #/kg) then divide again by 25.39 (25.39 mm/in) or just divide by 2.2 * 25.39 = 55.858 as a quick conversion. For example, a 1200 #/in spring equates to a 21.48 kg/mm spring.