SPCX BMX 4-bolt chainring

SPCX chainring - 4-bolt - BMX drivetrain - AllYoogs

SPCX BMX 4-bolt chainring

65,95 €

BMX CHILDREN’S PARTS

For   tracks – no european

The SPCX BMX 4-bolt chainring is ultra light, a definite advantage for the performance of your young riders (kids).

      • Centre distance : 104 mm – 4-bolt fixing for reduced chain pitch
      • Size : 71 to 77 teeth
      • Weight : 58 g to 68 g
      • Colour : golden
      • Material : 7075 aluminium
      • Surface treatment: hard anodised
      • Delivery times for pre-orders : 5/6 weeks

Choose your SPCX chainring

SKU: BPDFSPCX400 Categories: , , , Tags: , Brand:
SPCX chain kit - 4-bolt + tools
SPCX drivetrain Kit - 4 bolt + tools
248,95€ incl. VAT
SPCX chain kit - 4-bolt + chain guide + tools
SPCX chain Kit - 4 bolt + chain guide + tools
347,45€ incl. VAT
SPCX drivetrain kit - 4 bolt
SPCX drivetrain Kit - 4 bolt
164,75€ incl. VAT

Description

SPCX BMX 4-bolt chainring: optimized performance & lightness

The SPCX BMX 4-bolt chainring for children features an advanced design, developed through numerical mechanical simulation (FEM). Thanks to this technology, it offers increased resistance while significantly reducing weight.

AllYoogs® SPCX 4-bolt front sprocket are CNC-machined in France from 7075 aluminum, a material stronger than 6061 aluminum. Combined with hard anodization, it ensures maximum lightness and exceptional durability, extending the product’s lifespan.

A Chain Kit Designed for Performance

The SPCX chain kit is a real asset for young riders. This innovative drivetrain brings a minimum measured time gain of 2.4 to 2.8%, while making it easier to learn starts, manuals, and other essential techniques.

We offer a wide range of teeth suitable for children. We advise you to consult our comparison table to choose the right front sprocket and improve your rider’s performance.

Choose your SPCX 4-bolt drivetrain

Compatibility & Technical Limits

    • Our SPCX BMX 4-bolt chain kit can be fitted to BMX bikes up to frame size “EXPERT XL”
    • From the “PRO” frame, our children’s kit continues with the SPCE kit (same chain and tools).
    • The SPCE chain is only compatible with SPCX and SPCE race parts.
    • Our chain breaker is specific and the only compatible one on the market to lengthen or shorten the SPCE chain.
    • Patent Pending
    • Designed and developed by Allyoogs®. Made in France


    Our SPCX drivetrain kit fits all BMX frames except the following brands : Meybo HSX, Supercross Vision F1 and RSX, GT, 4NIX and the Meybo instant-engagement hubs.

💡For more details on our chain kit concept, we recommend reading our article. If you need more information on installation and maintenance BMX chain kit, you’ll find answers to your questions in our FAQ. Follow us on social networks

How to choose your SPCX BMX 4-bolt chainring ?

  1.  Development calculated in mm with a 20 x 1.1/8 tyre

  2.  Development calculated in mm with a 20 x 1.3/8 tyre

1.  Development calculated in mm with a 20 x 1.1/8 tyre

In the table below, find the value indicated at the intersection of the chainring and the cog of your child.

Example: cog = 16 and chainring = 37. The value to take into account = 376,3

CLASSIC FRONT SPROCKET 4-bolt 104 mm – 20 x 1.1/8 TYRE
REAR SPROCKET323334353637
38
39404142434445
18289,3298,3307,4316,4325,5334,5343,6352,6361,6370,7379,7388,8397,8 406,8
17306,3315,9325,5335,0344,6354,2363,8373,3382,9
392,5402,0411,6421,2 430,8
16325,5335,6345,8356,0
366,2376,3386,5396,7406,8417,0427,2437,3447,5457,7
15347,2358,0368,9379,7390,6401,4412,3423,1434,0444,8455,7

To obtain the SPCX equivalence :

In the table, find the values closest to those in the table above (same or higher values). The value to be taken into account is the one with the smallest cog.

Example with 376,3: the closest values are 376,3 and 378,0. So the choice is a 31 cog with a 72 chainring.

AllYoogsSPCX FRONT SPROCKET 4-bolt 104mm – 20 x 1.1/8 TYRE
SPCX REAR SPROCKET71727374757677
32361,1366,2371,2376,3381,4386,5391,6
31372,7378,0383,2388,5393,7399,0404,2
30385,1390,6396,0401,4406,8412,3417,7
29398,4404,0409,6415,3420,9426,5432,1
28412,6418,5424,3430,1435,9441,7447,5

 
 
 

2.  Development calculated in mm with a 20 x 1.3/8 tyre

In the table below, find the value indicated at the intersection of the chainring and the cog of your child.

Example: cog = 16 and chainring = 40. The value to take into account = 421,0

CLASSIC FRONT SPROCKET 4-bolt 104 mm – 20 x 1.3/8 TYRE
REAR SPROCKET323334353637
38
39404142434445
18299,4308.7318.1327.4336.8346.1355.5364.8374.2383.6392.9402.3411.6421,0
17317.0326.9336.8346.7356.6366.5376.4386.3396.2406.1416.0425.9435.8445,7
16336.8347.3357.8368.4378.9389.4399.9410.4421.0431.5442.0452,5463,1473,6
15359.2370.5381.7392.9404.1415.4426.6437.8449,0460,3471,5

To obtain the SPCX equivalence :

In the table, find the values closest to those in the table above (same or higher values). The value to be taken into account is the one with the smallest cog.

Example with 421,0: the closest values are 421,0 and 423,9. So the choice is a 29 cog with a 73 chainring.

AllYoogsSPCX FRONT SPROCKET 4-bolt 104mm – 20 x 1.3/8 TYRE
SPCX REAR SPROCKET71727374757677
32373,6378,9384,1389,4394,7399,9405,2
31385,7391,1396,5402,0407,4412,8418,3
30398,5404,1409,7415,4421,0426,6432,2
29412,3418,1423,9429,7435,5441,3447,1
28427,0433,0439,0445,0451,0457,1463,1

 

Depending on your child’s particularities (difficulty in starting, saturation…), we can be even more precise in the choice of our SPCX chain kit. Don’t hesitate to contact us by phone or whatsapp, we are here to help you!

Additional information

Weight 0,120 kg
Dimensions 24 × 18 × 1 cm
Size

71 teeth, 72 teeth, 73 teeth, 74 teeth, 75 teeth, 76 teeth, 77 teeth

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