SPCK Rear Sprocket

SPCK Rear sprocket - BMX Race - AllYoogs

SPCK Rear Sprocket

33,32€

The SPCK children’s BMX rear sprocket is super light for your young riders.

    • Type : rear sprocket for Single-speed cassette
    • Size : 28 to 35 teeth
    • Weight : 10 to 15 g depending on the number of teeth
    • Colour : golden
    • Material : 7075 aluminium
    • Surface treatment: hard anodised

Choose your SPCK rear sprocket

SKU: BPDRSPCK000EN Categories: , , , Tags: ,
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Description

The special machining of our BMX rear sprocket for children makes it possible to lighten the spline. This allows you to maintain a high power transmission capacity. Compatible with all cassette type freewheel bodies.

The AllYoogs® rear sprockets are machined by CNC in France from 7075-T6 aluminium (stronger than 6061). This material guarantees lightness and above all a very high resistance of the product thanks to the hard anodising. This treatment gives our products a longer life.

The SPCK chain kit is a definite advantage for young riders. In fact, our SPCK drivetrain brings a measured gain of between 2 and 2.8% on lap times, and makes it easier to learn to “start”, manuals… It’s currently the lightest on the market.

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.

  • Our SPCK BMX rear sprocket can be fitted to BMX bikes up to frame size “EXPERT” (weight limit 45kg = 99lb).
  • Thanks to the SPCK 27-teeth stainless steel sprocket with the SPCK chain tensioner, it is possible to push the limits of our kit up to “PRO” frames (weight limit 50kg = 110lb).
  • The SPCK chain kit is only compatible with SPCK race parts.
  • Patent Pending
  • Designed and developed by AllYoogs. Made in France
 

To learn more about the concept of our chain kit, we suggest you read our article.

How to choose your SPCK BMX rear sprocket ?

  • With a 4-bolt front sprocket

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

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

  • With a 5-bolt front sprocket

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

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

With a 4-bolt front sprocket

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 front sprocket and the cog of your child.

Example: cog = 16 and front sprocket = 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 SPCK equivalence :

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

Example with 376,3: the closest values are 378 and 379,7. The smallest cog is 30, so the choice is a 30 cog with a 70 front sprocket.

AllYoogsSPCK FRONT SPROCKET 4-bolt 104mm – 20 x 1.1/8 TYRE
SPCK REAR SPROCKET67686970717273
34320,7325,5330,3335,0339,8344,6349,4
33330,4335,3340,3345,2350,1355,1360,0
32340,7345,8350,9356,0361,1366,2371,2
31351,7357,0362,2
367,5372,7
378,0383,2
30363,4368,9374,3
379,7385,1390,6396,0
29376,0381,6387,2
392,8398,4404,0409,6
28389,4395,2401,0406,8412,6418,5424,3
27403,8409,8415,9421,9427,9434,0440,0

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

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

Example: rear sprocket = 16 and front sprocket = 40. The value to take into account = 421

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 SPCK equivalence :

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

Example with 421: the closest values are 423,9 and 424,1. The smallest cog is 27, so the choice is a 27 SPCK stainless steel cog with a 68 front sprocket.

AllYoogsSPCK FRONT SPROCKET 4-bolt 104mm – 20 x 1.3/8 TYRE
SPCK REAR SPROCKET67686970717273
34331.8336.8341.7346.7351.6356.6361.5
33341.9347.0352.1357.2362.3367.4372.5
32352.6357.8363.1368.4373.6378.9384.1
31363.9369.4374.8380.2385.7391.1396.5
30376.1381.7387.3392.9398.5404.1409.7
29389.0394.8400.7406.5412.3418.1423.9
28402.9408.9415.0421.0427.0433.0439.0
27417,9424,1430,3436,6442,8449,0455,3

With a 5-bolt front sprocket

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 front sprocket and your child’s cog.

Example: rear sprocket = 17 and front sprocket = 40. The value to take into account = 382,9

CLASSIC FRONT SPROCKET 5-bolt 110 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 SPCK equivalence :

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

Example with 382,9 : the closest values are : 383,2 and 385,1. The smallest cog is 30, so the choice is a 30 cog with a 71 front sprocket.

AllYoogsSPCK FRONT SPROCKET 5-bolt 110mm – 20 x 1.1/8 TYRE
SPCK REAR SPROCKET70717273
35325.5330.1334.8339.4
34335.0339.8344.6349.4
33345.2350.1355.1360.0
32356.0361.1366.2371.2
31367.5372.7378.0
383.2
30379.7385.1390.6
396.0
29392.8398.4404.0
409.6
28406.8412.6418.5424.3
27421,9427,9434,0440,0

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 your child’s front sprocket and cog.

Example : cog = 18 and front sprocket = 41. The value to take into account = 383,6

CLASSIC FRONT SPROCKET 5-bolt 110 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 SPCK equivalence :

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

Example with 383,6 : the closest values are : 384,1 and 385,7 The smallest rear sprocket is 31, so the choice is a 31 cog with a 71 front sprocket.

AllYoogsSPCK REAR SPROCKET 5-bolt 110 mm – 20 x 1.3/8 TYRE
REAR SPROCKET70717273
35336.8341.6346.4351.2
34346.7351.6356.6361.5
33357.2362.3367.4372.5
32368.4373.6378.9384.1
31380.2385.7391.1396.5
30392.9398.5404.1409.7
29406.5412.3418.1423.9
28421.0427.0433.0439.0
27436,6442,8449,0455,3

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

Additional information

Weight 0,030 kg
Dimensions 27 × 20 × 1 cm
Size

28 teeth, 29 teeth, 30 teeth, 31 teeth, 32 teeth, 33 teeth, 34 teeth, 35 teeth

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