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Wheel seal sizes
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TOPIC: Wheel seal sizes

Wheel seal sizes 4 months, 2 weeks ago #17649

This advice is coming from my background as a mechanic.
My Bike is a DR-Z400E 2016 model.

I searched for wheel seal sizes but couldn't find any concrete answers so here are the correct seal sizes for those who want to purchase seals then install them.

Front seals: 25x37x7
43x58x7 (Speedo drive)

Rear seals: 29x42x10

These seals are all wider than the standard seals because the standard width of 6mm was unavailable, front seals are 7mm and the rears are 10mm wide. Total cost was under $40.00.

The difference in width worked in my favour because the bosses where the seals run were grooved out badly, using wider seals puts the sealing lip on a new position instead of being on a wear groove. (unfortunately not the speedo drive)

Also the rear seals are factory installed in reverse, with the tensioning spring facing out, exposed to the elements.
My seals were missing their springs, I've never seen seals fitted this way, being one to normally "go by the book" I decided to install them the correct way and not as Suzuki did (in my opinion).

There are three reasons I did that, firstly the front wheel has the seals fitted in the normal orientation so what's the difference with the rear wheel, both wheels get their fair share of dirt and can be submerged etc...

Secondly the spring, which is normally running in oil or grease has no corrosion protection, therefore as mine did, they rusted off. The correct orientation stops this.

And thirdly, I was taught the seal's dust lip (the smaller lip) is a first line of defence against water and grit, protecting the main lip. A reversed seal exposes the main lip to the elements.

Rightly or wrongly that's what I did. My wheel bearings were OK even though the seals were all either damaged or badly worn and grit had gotten past them.

You could fit the rear seals either way but I did what I think is right in theory. Ask your seal guy which way a seal goes and you'll get the same reply as my thoughts.
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