Castelli vs Lululemon:Which is more popular?
In September 2026, Castelli had more branded searches than Lululemon among bike shorts brands worldwide. Castelli had about 110,000 branded searches, while Lululemon had 3,600. Castelli made up 24.4% of all bike shorts brand searches we track, and Lululemon accounted for 0.8%. When we asked ChatGPT and Google AI Overviews about bike shorts brands, Castelli appeared in four of the five answers and Lululemon in two. Castelli and Lululemon were each mentioned first in two of the four answers.
Who do people search for more?
Castelli, about 31 searches for every 1 for Lululemon
Who does AI mention more?
Castelli, mentioned in 4 of 5 answers, Lululemon in 2
Who does AI recommend more?
Each is named first in 2 of 4 answers.
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Top bike shorts brands in ChatGPT and Google AI Overviews
In three ChatGPT questions and two Google AI Overviews, Castelli was mentioned in four out of five: in two of the three ChatGPT answers and in both Google AI Overviews. Lululemon was mentioned in two out of five: in two of the three ChatGPT answers, but not in either of the two Google AI Overviews. Castelli and Lululemon were each listed first in two of the four answers.
Most recommended by AI
Brands get a higher ranking if they are mentioned earlier in the answers.
Mentioned by AI
Each dot is one answer, filled in when that answer mentions the brand.
Rapha4 of 5Named in 2 of 3 ChatGPT answersNamed in 2 of 2 Google answers- Castelli4 of 5Named in 2 of 3 ChatGPT answersNamed in 2 of 2 Google answers
Assos3 of 5Named in 1 of 3 ChatGPT answersNamed in 2 of 2 Google answers
Pearl Izumi3 of 5Named in 2 of 3 ChatGPT answersNamed in 1 of 2 Google answers
Baleaf2 of 5Named in 2 of 3 ChatGPT answersNamed in 0 of 2 Google answers
Lululemon2 of 5Named in 2 of 3 ChatGPT answersNamed in 0 of 2 Google answers
See every answer about bike shorts brands
5 answers
Asked ChatGPT
“Which bike shorts brand should I buy?”
Asked ChatGPT
“What are the best bike shorts brands?”
Asked ChatGPT
“What's the best bike shorts brand for long distance comfort?”
Searched Google, AI Overview
“best bike shorts”
Searched Google, AI Overview
“bike shorts for men”
Brands are shown in the order each answer named them. The survey took place in the United States on October 20, 2026.
Is Castelli or Lululemon more popular in search?
This chart shows how often people search Google for Castelli and Lululemon by name. Each line represents a brand's share of searches for all six bike shorts brands we track, month by month, from English-language searches worldwide.
Share of searches by month for Castelli, Lululemon. The figures are in the table below the chart.
View monthly share of searches table
| Month | Assos | Rapha | Castelli | Pearl Izumi | Baleaf | Lululemon |
|---|---|---|---|---|---|---|
| Oct 2025 | 32.6% | 32.6% | 26.7% | 5.4% | 2% | 0.71% |
| Nov 2025 | 34.3% | 34.3% | 23% | 5.7% | 2.1% | 0.61% |
| Dec 2025 | 34.2% | 34.2% | 22.8% | 5.6% | 2.5% | 0.6% |
| Jan 2026 | 32.5% | 32.5% | 26.6% | 5.3% | 2.4% | 0.71% |
| Feb 2026 | 30.3% | 30.3% | 30.3% | 6.1% | 2.2% | 0.65% |
| Mar 2026 | 36.6% | 30% | 24.6% | 6% | 2.2% | 0.65% |
| Apr 2026 | 34.7% | 28.5% | 28.5% | 5.7% | 2.1% | 0.62% |
| May 2026 | 32.2% | 32.2% | 26.4% | 6.5% | 1.9% | 0.71% |
| Jun 2026 | 36.5% | 30% | 24.5% | 6% | 2.2% | 0.8% |
| Jul 2026 | 38.9% | 31.8% | 21.4% | 5.2% | 1.9% | 0.7% |
| Aug 2026 | 37.2% | 30.4% | 24.9% | 5% | 1.8% | 0.67% |
| Sep 2026 | 36.6% | 30% | 24.4% | 6% | 2.2% | 0.8% |
How has the Castelli and Lululemon comparison changed over the last 12 months?
3 findings
- Castelli was ahead of Lululemon in every measured month of the 12 months ending September 2026.
- Across the 12 months ending September 2026, Castelli’s share of searches among bike shorts brands worldwide moved from 26.7% to 24.4%, and its estimated monthly branded searches moved from 135K to 110K.
- Across the 12 months ending September 2026, Lululemon’s share of searches among bike shorts brands worldwide moved from 0.71% to 0.8%, and its estimated monthly branded searches held steady at 3.6K.
How did search popularity change for bike shorts brands worldwide in September 2026?
1 change
In September 2026, Castelli lost share of searches among bike shorts brands worldwide, from 24.9% to 24.4%.
How are branded searches counted?
2 search terms
Brandwave collects information about searches that people make online using Castelli’s and Lululemon’s names. When viewed over time, estimated search volumes for these branded terms can be used to understand whether interest in the brands is growing, holding steady, or fading.
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