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1998 KTM 125SX

Renthal Front Sprocket

Retail: $25.99
$22.99
You Save: $3.00 (12%)
OEM Stock Sizes for a 1998 KTM 125SX
Chain Type: 520 Chain Length: 118
Front Sprocket: 13 Rear Sprocket: 50
For reference only. Please verify with owners manual.
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FITS: 1998 KTM 125SX change
 
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Renthal Front Sprocket

Product Description

When looking to replace your front sprocket, Renthal front sprockets are an easy choice because of their strength and inexpensive price tag.

  • Also known as "chainwheels", Renthal front sprockets are precision manufactured to withstand the rigors of supercross, motocross, and enduro racing.
  • Renthal Front Sprockets are made out of 655M13 nickel-chrome-molybdenum alloy steel. What does that mean to you? Ultimate strength and hardness.
  • Self-cleaning mud grooves prevent the build up of dirt.
  • Precision machining to extremely tight tolerances ensures that Renthal front sprockets are always within spec.
  • Note: Image is for reference only, actual product may vary.
  • Customer Reviews
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(72)
4.7 out of 5 stars
5 star   60
4 star   7
3 star   3
2 star   1
1 star   1
250rnut Location: Gig Harbor, WA, USA
1-10 of 72
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Location: Gig Harbor, WA, USA
We will see

Great style and performance. Easy to install and we will see if it can hold up. Have not had it on the bike but one ride so we will see if it holds up

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Verified Purchaser
Location: Houston, TX, USA
Good purchase

I've always used Renthal front sprocket, I'm happy with it, no complaints!

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Verified Purchaser
Rethanal Spokects

Excellent choice for fast performance upgrades and always high quality. Props to Motosport for fast processing and shipments.

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Verified Purchaser
Location: ND

Very durable, Looks great, and easy to install. would recommend to everyone!

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Top 1000 Contributor Verified Purchaser
Location: Geismar, LA, USA
Great Choice

I bought this Renthal Front Sprocket for my sons KX85, it is a great front sprocket - great self cleaning action when riding in sand.

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Location: PA
Renthal is the best, hands down!

Bought the 13 thooth to replace the stock 14t for tight woods/trail riding and it is awesome! Lose a little bit up top but its better than riding the clutch all day when going through tight sections. Seems to be great quality. No issues and installing was a piece of cake.

Renthal Front Sprocket
Overall
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Location: Cranberry Twp. PA
This parts shattered

Never had a sprockets fail this way. It literally cracked into 4 pieces while we were way back in the woods. What a pain getting the bike out on a Saturday afternoon. This sprocket had less than 5 hours on it. I personally will not buy this brand again. It will take a week for my legs to recover from pushing.

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Verified Purchaser
Great low range.. 12t

if you wont more get up and go... go with 12t (13t stock for 350 raptor) if your wonting more in the top end go with the 15t

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Verified Purchaser
Location: Land of 10,000 Lakes
Top notch goods from Renthal

Renthal has always delivered high quality drive line parts and this front sprocket is no different. Slips on like OE and lasts.

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Verified Purchaser
Location: nz
Renthal Front Sprocket

Fit and finish is good but whats really stood out so far is how hard wearing these have turned out to be. 40hrs or hard sand riding and it could probably go another 5/10. Others we've used tend to last less than half this. An good combo to get even more life would be to match it up with the rental o-ring chain and a steel rear sprocket, in our opinion.

1-10 of 72
Total Questions (11)
Questions with answers:
  11
Questions without answers:
0
Trailriding?...
Sporttrax Location: California
1-10 of 11
KeeKee 3 months 9 days ago Location: Canada
Need a front sprocket to fit 1995 Polaris Xplorer 400 front?
this takes a 520 chain
Expert MotoSport Staff
3 months 7 days ago Location: Portland, OR, USA
Unfortunately, I do not show any aftermarket sprocket options that would fit your 1995 Polaris Xplorer 400. I would recommend ordering the direct OEM replacement sprocket from Polaris for that. The OEM diagrams with that sprocket can be found here: http://www.motosport.com/utility/oem-parts/POLARIS/1995/XPLORER/GEARCASE-ASSEMBLY-XPLORER-4X4-W959140
bobthebuilder Over 6 months ago
Were can I get a sprocket that will fit my 91 trx350? or will I have to have one made. If so what is the specs?
Putting my fourwheeler engine on a gocart
MotoSport Staff
Over 6 months ago Location: Portland, OR, USA
The 2001 TRX350 is shaft driven model, sprockets are not available for this model.
Hendu Over 4 years ago Location: Spokane, Washington
Don't you take a tooth off the front sprocket or add teeth to the back sprocket to gain low end and in turn loose top end?
Top 500 Contributor
Over 4 years ago Location: Austin, TX
YES. Adding a tooth to the rear sprocket on a bike will provide more "low end" and reduce "top end". The reverse is also true when removing teeth from the rear sprocket. The front sprocket is the exact opposite of the rear but each tooth has more of an impact. For example, dropping 1 tooth on the front sprocket is roughly the equivalent of ADDING 2-21/2 to the rear sprocket.
Over 9 months ago Location: PA
yes. Depending on how much low end you want dropping a tooth in the front may be too much. For every tooth you lose in the front it is equal to almost 3 teeth gained in the rear. Sprockets are cheap. You might want to start out dropping a tooth in the front and if you find that is too much, you can always drop a tooth or two in the rear in addition to the smaller front.
Zacky Over 4 years ago
I want more low end power.?
What should i put on my 2004 CRF 250R to give it a wider gear ratio and more low end power?
Over 4 years ago
For more torque you make the front smaller and the back bigger but kills your top end speed. For more top end speed you make the front bigger and make the back smaller and kills you torque. I'm not sure the ratios would be but for my YZ125 i put a 52 tooth on the back and made a big difference with getting up hills easier.
Tre9 Over 4 years ago
Srocket size?
ok so i have a 2003 cr250r and i have a 13t sprocket on the front and a 46t sprocket on the back. so i bought a 49t for the back and now my bike has way to much torque what size can i put on the front to even the gearing out?...or make it the same as the 13t to 46t...thanks
Expert MotoSport Staff
Over 4 years ago Location: USA
If you add one tooth to the front sprocket it will be the equivalent to loosing 2 1/2 teeth from the rear. so if you got a 14t front, it would make the rear sprocket comparable to a 46 - 46 1/2T.
Top 500 Contributor
Over 4 years ago Location: Austin, TX
Adding 1 tooth to the front sprocket (14t) would be like dropping about 2-21/2 teeth from the rear. A 14t / 49t would be similar to a 13t front and 46-1/2t rear setup.
num817 Over 4 years ago
Would 14t or 16t give my 4 wheeler the most torque?
MotoSport Staff
Over 4 years ago Location: P+RTLAND
if you want more torque, your going to want to go down teeth in the front from where you are at right now. So if your running a 15, a 14t is going to give you more bottom end.
Over 11 months ago
the 14t would give you more torque. the 16t would give you about 4-6 mph on the top end depending on your stock sprocket
bigscott Over 4 years ago
What is the stock number of teeth on the front sprocket?
Expert MotoSport Staff
Over 4 years ago Location: Portland, OR
that depends on the kind of bike.
SuzukiKid239 Over 4 years ago
I know there real good sprockets?
Im going to get both I have a Suzuki rm85 and im going to start racing hare scrambles how many teeth would you recomend on the front and back because i want more bottem end power
Top 250 Contributor Top 500 Contributor
Over 4 years ago Location: honolulu, HI
for more bottom end power you want less teeth on the front or more on the back. it all depends on your current gearing. just remember that 1 tooth in the front is equal to about 2-3 teeth on the back.
Sporttrax Over 5 years ago Location: California
Trailriding?
I have a 05 trx 400ex and I want to lower my gear ratio for trail riding right now I have the stock 14t front sprocket and a 39t rear sprocket what would you suggest as the quickest and best way to achieve this without losing sand ability? Thanks
MotoSport Staff
Over 5 years ago Location: Por+land
Try going down to a 13t on the front and see how that works for you. It's hard to suggest what gearing you should run since everyone has their own preference. I would drop down on the front sprocket though thats going to be easiest and cheapest way to do it.
eric850 Over 5 years ago
How many teeth would i want for low end power?
how many teeth would i want for low end power
Expert MotoSport Staff
Over 5 years ago Location: PDX
You would want to add teeth on the rear.
1-10 of 11

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